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Boats and Streams questions

Upstream and downstream speeds.

1. A boat goes 66 km downstream. Its speed in still water is 18 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 5 hours
  2. 3 hours
  3. 2 hours
  4. 4 hours
Answer

B. 3 hours Downstream speed = 18 + 4 = 22 km/h. Time = 66/22 = 3 h.

2. A boat's speed downstream is 22 km/h and upstream is 14 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 19 km/h and 5 km/h
  2. 4 km/h and 18 km/h
  3. 18 km/h and 4 km/h
  4. 22 km/h and 14 km/h
Answer

C. 18 km/h and 4 km/h Boat = (down + up)/2 = (22 + 14)/2 = 18. Stream = (down − up)/2 = 4.

3. A boat goes 57 km downstream. Its speed in still water is 18 km/h and the stream flows at 1 km/h. How long does the trip take?

  1. 1 hour
  2. 5 hours
  3. 4 hours
  4. 3 hours
Answer

D. 3 hours Downstream speed = 18 + 1 = 19 km/h. Time = 57/19 = 3 h.

4. A boat's speed downstream is 11 km/h and upstream is 3 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 7 km/h and 4 km/h
  2. 4 km/h and 7 km/h
  3. 8 km/h and 5 km/h
  4. 11 km/h and 3 km/h
Answer

A. 7 km/h and 4 km/h Boat = (down + up)/2 = (11 + 3)/2 = 7. Stream = (down − up)/2 = 4.

5. A boat goes 72 km downstream. Its speed in still water is 17 km/h and the stream flows at 1 km/h. How long does the trip take?

  1. 4 hours
  2. 3 hours
  3. 6 hours
  4. 5 hours
Answer

A. 4 hours Downstream speed = 17 + 1 = 18 km/h. Time = 72/18 = 4 h.

6. A boat's speed downstream is 11 km/h and upstream is 7 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 10 km/h and 3 km/h
  2. 11 km/h and 7 km/h
  3. 9 km/h and 2 km/h
  4. 2 km/h and 9 km/h
Answer

C. 9 km/h and 2 km/h Boat = (down + up)/2 = (11 + 7)/2 = 9. Stream = (down − up)/2 = 2.

7. A boat goes 57 km downstream. Its speed in still water is 17 km/h and the stream flows at 2 km/h. How long does the trip take?

  1. 2 hours
  2. 3 hours
  3. 4 hours
  4. 5 hours
Answer

B. 3 hours Downstream speed = 17 + 2 = 19 km/h. Time = 57/19 = 3 h.

8. A boat's speed downstream is 9 km/h and upstream is 7 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 9 km/h and 7 km/h
  2. 8 km/h and 1 km/h
  3. 9 km/h and 2 km/h
  4. 1 km/h and 8 km/h
Answer

B. 8 km/h and 1 km/h Boat = (down + up)/2 = (9 + 7)/2 = 8. Stream = (down − up)/2 = 1.

9. A boat goes 14 km downstream. Its speed in still water is 11 km/h and the stream flows at 3 km/h. How long does the trip take?

  1. 4 hours
  2. 2 hours
  3. 3 hours
  4. 1 hour
Answer

D. 1 hour Downstream speed = 11 + 3 = 14 km/h. Time = 14/14 = 1 h.

10. A boat's speed downstream is 10 km/h and upstream is 4 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 8 km/h and 4 km/h
  2. 10 km/h and 4 km/h
  3. 3 km/h and 7 km/h
  4. 7 km/h and 3 km/h
Answer

D. 7 km/h and 3 km/h Boat = (down + up)/2 = (10 + 4)/2 = 7. Stream = (down − up)/2 = 3.

11. A boat goes 12 km downstream. Its speed in still water is 8 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 2 hours
  2. 3 hours
  3. 1 hour
  4. 4 hours
Answer

C. 1 hour Downstream speed = 8 + 4 = 12 km/h. Time = 12/12 = 1 h.

12. A boat's speed downstream is 19 km/h and upstream is 15 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 18 km/h and 3 km/h
  2. 17 km/h and 2 km/h
  3. 2 km/h and 17 km/h
  4. 19 km/h and 15 km/h
Answer

B. 17 km/h and 2 km/h Boat = (down + up)/2 = (19 + 15)/2 = 17. Stream = (down − up)/2 = 2.

13. A boat goes 45 km downstream. Its speed in still water is 14 km/h and the stream flows at 1 km/h. How long does the trip take?

  1. 4 hours
  2. 2 hours
  3. 3 hours
  4. 1 hour
Answer

C. 3 hours Downstream speed = 14 + 1 = 15 km/h. Time = 45/15 = 3 h.

14. A boat's speed downstream is 15 km/h and upstream is 9 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 3 km/h and 12 km/h
  2. 12 km/h and 3 km/h
  3. 13 km/h and 4 km/h
  4. 15 km/h and 9 km/h
Answer

B. 12 km/h and 3 km/h Boat = (down + up)/2 = (15 + 9)/2 = 12. Stream = (down − up)/2 = 3.

15. A boat goes 16 km downstream. Its speed in still water is 12 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 1 hour
  2. 4 hours
  3. 3 hours
  4. 2 hours
Answer

A. 1 hour Downstream speed = 12 + 4 = 16 km/h. Time = 16/16 = 1 h.

16. A boat's speed downstream is 13 km/h and upstream is 11 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 13 km/h and 2 km/h
  2. 1 km/h and 12 km/h
  3. 13 km/h and 11 km/h
  4. 12 km/h and 1 km/h
Answer

D. 12 km/h and 1 km/h Boat = (down + up)/2 = (13 + 11)/2 = 12. Stream = (down − up)/2 = 1.

17. A boat goes 14 km downstream. Its speed in still water is 10 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 2 hours
  2. 1 hour
  3. 4 hours
  4. 3 hours
Answer

B. 1 hour Downstream speed = 10 + 4 = 14 km/h. Time = 14/14 = 1 h.

18. A boat's speed downstream is 18 km/h and upstream is 10 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 4 km/h and 14 km/h
  2. 15 km/h and 5 km/h
  3. 14 km/h and 4 km/h
  4. 18 km/h and 10 km/h
Answer

C. 14 km/h and 4 km/h Boat = (down + up)/2 = (18 + 10)/2 = 14. Stream = (down − up)/2 = 4.

19. A boat goes 28 km downstream. Its speed in still water is 10 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 4 hours
  2. 2 hours
  3. 1 hour
  4. 3 hours
Answer

B. 2 hours Downstream speed = 10 + 4 = 14 km/h. Time = 28/14 = 2 h.

20. A boat's speed downstream is 19 km/h and upstream is 11 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 4 km/h and 15 km/h
  2. 15 km/h and 4 km/h
  3. 19 km/h and 11 km/h
  4. 16 km/h and 5 km/h
Answer

B. 15 km/h and 4 km/h Boat = (down + up)/2 = (19 + 11)/2 = 15. Stream = (down − up)/2 = 4.

21. A boat goes 48 km downstream. Its speed in still water is 8 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 5 hours
  2. 4 hours
  3. 6 hours
  4. 3 hours
Answer

B. 4 hours Downstream speed = 8 + 4 = 12 km/h. Time = 48/12 = 4 h.

22. A boat's speed downstream is 24 km/h and upstream is 14 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 19 km/h and 5 km/h
  2. 24 km/h and 14 km/h
  3. 5 km/h and 19 km/h
  4. 20 km/h and 6 km/h
Answer

A. 19 km/h and 5 km/h Boat = (down + up)/2 = (24 + 14)/2 = 19. Stream = (down − up)/2 = 5.

23. A boat goes 42 km downstream. Its speed in still water is 19 km/h and the stream flows at 2 km/h. How long does the trip take?

  1. 3 hours
  2. 2 hours
  3. 1 hour
  4. 4 hours
Answer

B. 2 hours Downstream speed = 19 + 2 = 21 km/h. Time = 42/21 = 2 h.

24. A boat's speed downstream is 17 km/h and upstream is 11 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 15 km/h and 4 km/h
  2. 14 km/h and 3 km/h
  3. 17 km/h and 11 km/h
  4. 3 km/h and 14 km/h
Answer

B. 14 km/h and 3 km/h Boat = (down + up)/2 = (17 + 11)/2 = 14. Stream = (down − up)/2 = 3.

25. A boat goes 12 km downstream. Its speed in still water is 9 km/h and the stream flows at 3 km/h. How long does the trip take?

  1. 1 hour
  2. 3 hours
  3. 4 hours
  4. 2 hours
Answer

A. 1 hour Downstream speed = 9 + 3 = 12 km/h. Time = 12/12 = 1 h.

26. A boat's speed downstream is 24 km/h and upstream is 16 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 24 km/h and 16 km/h
  2. 21 km/h and 5 km/h
  3. 4 km/h and 20 km/h
  4. 20 km/h and 4 km/h
Answer

D. 20 km/h and 4 km/h Boat = (down + up)/2 = (24 + 16)/2 = 20. Stream = (down − up)/2 = 4.

27. A boat goes 11 km downstream. Its speed in still water is 8 km/h and the stream flows at 3 km/h. How long does the trip take?

  1. 1 hour
  2. 2 hours
  3. 4 hours
  4. 3 hours
Answer

A. 1 hour Downstream speed = 8 + 3 = 11 km/h. Time = 11/11 = 1 h.

28. A boat's speed downstream is 14 km/h and upstream is 6 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 4 km/h and 10 km/h
  2. 10 km/h and 4 km/h
  3. 11 km/h and 5 km/h
  4. 14 km/h and 6 km/h
Answer

B. 10 km/h and 4 km/h Boat = (down + up)/2 = (14 + 6)/2 = 10. Stream = (down − up)/2 = 4.

29. A boat goes 30 km downstream. Its speed in still water is 11 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 4 hours
  2. 1 hour
  3. 2 hours
  4. 3 hours
Answer

C. 2 hours Downstream speed = 11 + 4 = 15 km/h. Time = 30/15 = 2 h.

30. A boat's speed downstream is 16 km/h and upstream is 10 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 16 km/h and 10 km/h
  2. 14 km/h and 4 km/h
  3. 3 km/h and 13 km/h
  4. 13 km/h and 3 km/h
Answer

D. 13 km/h and 3 km/h Boat = (down + up)/2 = (16 + 10)/2 = 13. Stream = (down − up)/2 = 3.

31. A boat goes 45 km downstream. Its speed in still water is 11 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 5 hours
  2. 3 hours
  3. 4 hours
  4. 2 hours
Answer

B. 3 hours Downstream speed = 11 + 4 = 15 km/h. Time = 45/15 = 3 h.

32. A boat's speed downstream is 16 km/h and upstream is 12 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 2 km/h and 14 km/h
  2. 16 km/h and 12 km/h
  3. 14 km/h and 2 km/h
  4. 15 km/h and 3 km/h
Answer

C. 14 km/h and 2 km/h Boat = (down + up)/2 = (16 + 12)/2 = 14. Stream = (down − up)/2 = 2.

33. A boat goes 40 km downstream. Its speed in still water is 19 km/h and the stream flows at 1 km/h. How long does the trip take?

  1. 2 hours
  2. 1 hour
  3. 4 hours
  4. 3 hours
Answer

A. 2 hours Downstream speed = 19 + 1 = 20 km/h. Time = 40/20 = 2 h.

34. A boat's speed downstream is 23 km/h and upstream is 15 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 4 km/h and 19 km/h
  2. 20 km/h and 5 km/h
  3. 23 km/h and 15 km/h
  4. 19 km/h and 4 km/h
Answer

D. 19 km/h and 4 km/h Boat = (down + up)/2 = (23 + 15)/2 = 19. Stream = (down − up)/2 = 4.

35. A boat goes 80 km downstream. Its speed in still water is 19 km/h and the stream flows at 1 km/h. How long does the trip take?

  1. 5 hours
  2. 3 hours
  3. 2 hours
  4. 4 hours
Answer

D. 4 hours Downstream speed = 19 + 1 = 20 km/h. Time = 80/20 = 4 h.

36. A boat's speed downstream is 11 km/h and upstream is 5 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 3 km/h and 8 km/h
  2. 9 km/h and 4 km/h
  3. 8 km/h and 3 km/h
  4. 11 km/h and 5 km/h
Answer

C. 8 km/h and 3 km/h Boat = (down + up)/2 = (11 + 5)/2 = 8. Stream = (down − up)/2 = 3.

37. A boat goes 60 km downstream. Its speed in still water is 13 km/h and the stream flows at 2 km/h. How long does the trip take?

  1. 4 hours
  2. 6 hours
  3. 3 hours
  4. 5 hours
Answer

A. 4 hours Downstream speed = 13 + 2 = 15 km/h. Time = 60/15 = 4 h.

38. A boat's speed downstream is 8 km/h and upstream is 4 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 6 km/h and 2 km/h
  2. 2 km/h and 6 km/h
  3. 7 km/h and 3 km/h
  4. 8 km/h and 4 km/h
Answer

A. 6 km/h and 2 km/h Boat = (down + up)/2 = (8 + 4)/2 = 6. Stream = (down − up)/2 = 2.

39. A boat goes 42 km downstream. Its speed in still water is 10 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 4 hours
  2. 1 hour
  3. 3 hours
  4. 2 hours
Answer

C. 3 hours Downstream speed = 10 + 4 = 14 km/h. Time = 42/14 = 3 h.

40. A boat's speed downstream is 13 km/h and upstream is 3 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 8 km/h and 5 km/h
  2. 5 km/h and 8 km/h
  3. 13 km/h and 3 km/h
  4. 9 km/h and 6 km/h
Answer

A. 8 km/h and 5 km/h Boat = (down + up)/2 = (13 + 3)/2 = 8. Stream = (down − up)/2 = 5.

41. A boat goes 24 km downstream. Its speed in still water is 11 km/h and the stream flows at 1 km/h. How long does the trip take?

  1. 3 hours
  2. 2 hours
  3. 4 hours
  4. 1 hour
Answer

B. 2 hours Downstream speed = 11 + 1 = 12 km/h. Time = 24/12 = 2 h.

42. A boat's speed downstream is 18 km/h and upstream is 12 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 18 km/h and 12 km/h
  2. 15 km/h and 3 km/h
  3. 3 km/h and 15 km/h
  4. 16 km/h and 4 km/h
Answer

B. 15 km/h and 3 km/h Boat = (down + up)/2 = (18 + 12)/2 = 15. Stream = (down − up)/2 = 3.

43. A boat goes 10 km downstream. Its speed in still water is 9 km/h and the stream flows at 1 km/h. How long does the trip take?

  1. 1 hour
  2. 4 hours
  3. 3 hours
  4. 2 hours
Answer

A. 1 hour Downstream speed = 9 + 1 = 10 km/h. Time = 10/10 = 1 h.

44. A boat's speed downstream is 17 km/h and upstream is 15 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 17 km/h and 2 km/h
  2. 1 km/h and 16 km/h
  3. 16 km/h and 1 km/h
  4. 17 km/h and 15 km/h
Answer

C. 16 km/h and 1 km/h Boat = (down + up)/2 = (17 + 15)/2 = 16. Stream = (down − up)/2 = 1.

45. A boat goes 18 km downstream. Its speed in still water is 8 km/h and the stream flows at 1 km/h. How long does the trip take?

  1. 3 hours
  2. 2 hours
  3. 1 hour
  4. 4 hours
Answer

B. 2 hours Downstream speed = 8 + 1 = 9 km/h. Time = 18/9 = 2 h.

46. A boat's speed downstream is 21 km/h and upstream is 17 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 19 km/h and 2 km/h
  2. 2 km/h and 19 km/h
  3. 20 km/h and 3 km/h
  4. 21 km/h and 17 km/h
Answer

A. 19 km/h and 2 km/h Boat = (down + up)/2 = (21 + 17)/2 = 19. Stream = (down − up)/2 = 2.

47. A boat goes 80 km downstream. Its speed in still water is 17 km/h and the stream flows at 3 km/h. How long does the trip take?

  1. 3 hours
  2. 5 hours
  3. 4 hours
  4. 2 hours
Answer

C. 4 hours Downstream speed = 17 + 3 = 20 km/h. Time = 80/20 = 4 h.

48. A boat's speed downstream is 12 km/h and upstream is 6 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 3 km/h and 9 km/h
  2. 10 km/h and 4 km/h
  3. 12 km/h and 6 km/h
  4. 9 km/h and 3 km/h
Answer

D. 9 km/h and 3 km/h Boat = (down + up)/2 = (12 + 6)/2 = 9. Stream = (down − up)/2 = 3.

49. A boat goes 32 km downstream. Its speed in still water is 12 km/h and the stream flows at 4 km/h. How long does the trip take?

  1. 1 hour
  2. 3 hours
  3. 2 hours
  4. 4 hours
Answer

C. 2 hours Downstream speed = 12 + 4 = 16 km/h. Time = 32/16 = 2 h.

50. A boat's speed downstream is 9 km/h and upstream is 5 km/h. What are the speed of the boat in still water and the speed of the stream?

  1. 9 km/h and 5 km/h
  2. 8 km/h and 3 km/h
  3. 2 km/h and 7 km/h
  4. 7 km/h and 2 km/h
Answer

D. 7 km/h and 2 km/h Boat = (down + up)/2 = (9 + 5)/2 = 7. Stream = (down − up)/2 = 2.

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