Boats and Streams Problems Practice Question and Answer

Q:

A man rows to a place 35 km in distance and back in 10 hours 30 minutes. He found that he can row 5 km with the stream in the same time as he can row 4 km against the stream. Find the rate of flow of the stream? 

4296 0

  • 1
    1.33 km/hr
    Correct
    Wrong
  • 2
    1.5 km/hr
    Correct
    Wrong
  • 3
    1 km/hr
    Correct
    Wrong
  • 4
    0.75 km/hr
    Correct
    Wrong
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Answer : 4. "0.75 km/hr"

Q:

Ratio between speed of boat in still water to speed of stream is 7 : 2. If 126 km is travelled downstream in 3.5 hours then find the difference between speed of boat in still water to speed of stream(in kmph)?

1460 0

  • 1
    15
    Correct
    Wrong
  • 2
    22
    Correct
    Wrong
  • 3
    24
    Correct
    Wrong
  • 4
    20
    Correct
    Wrong
  • 5
    18
    Correct
    Wrong
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Answer : 4. "20"

Q: A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively? 1518 0

  • 1
    7:4
    Correct
    Wrong
  • 2
    11:4
    Correct
    Wrong
  • 3
    4:7
    Correct
    Wrong
  • 4
    8:3
    Correct
    Wrong
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Answer : 4. "8:3"
Explanation :

Answer: D) 8:3 Explanation: Let the speed of the boat upstream be p kmph and that of downstream be q kmph   Time for upstream = 8 hrs 48 min = 845hrs   Time for downstream = 4 hrs   Distance in both the cases is same.   => p x  845= q x 4   => 44p/5 = 4q   => q = 11p/5    Now, the required ratio of Speed of boat : Speed of water current   = q+p2:q-p2   => (11p/5 + p)/2  : (11p/5 - p)/2   => 8 : 3

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