Question 24

A man rows down a river 15 km in 3 hrs. with the stream and returns in $$7\frac{1}{2}$$, The rate at which he rows in still water is

Solution

speed of man = x

speed of stream = y

he rows down the river 15 km in 3 hrs, i.e; x+y = 15/3 = 5kmph -------(1)

and he took 7.5hrs during upstream

i,e; x-y = 15/7.5 = 2kmph-------(2)

on solving (1) and (2)

x+y=5

x-y=2

x = 3.5kmph

so the answer is option C.

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