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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?

Correct Answer: 8 : 3

Explanation:

Let the man's rate upstream be x kmph and that downstream be y kmph.


Then, distance covered upstream in 8 hrs 48 min = Distance covered downstream in 4 hrs.



x x 8 4 = (y x 4)
5



44 x =4y
5



y = 11 x.
5



∴ Required ratio = y + x : y - x
2 2



   = 16x x 1 : 6x x 1
5 2 5 2



   = 8 : 3
5 5


   = 8 : 3.


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