If a boat running upstream takes 7 hours to cover a certain distance, while it takes 4 hours to cover the same distance running downstream, then the ratio between the speed of the boat to the speed of the water current is what?
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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×854)=(y×4)
→444x=4y
→y=511x
→ Required ratio =(2y+x):(2y−x)
=(516x×21):(56x×21)
=58:53
=8:3
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