Discussion

A man can row at 5 km/hr in still water, if the river is running at 1 km/hr it takes him 75 minutes to row to a place and back. How far is the place?

Answer: B

Speed downstream = (5+1)km/hr = 6 km/hr

Speed upstream = (5-1)km/hr = 4 km/hr

Let the required distance be x km.

Then x/6 + x/4 = 75/60 = 5/4 => (2x + 3x) =15 => x =3.

Required distance = 3 km

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