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Q.

A man can swim with a speed of 4 kmph in still water. He crosses a river 1 km wide that flows steadily at 3 kmph. If he makes his strokes normal to the river current, how far down the river does he go when he reaches the other bank?

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a

500 m

b

600 m

c

750 m

d

850 m

answer is C.

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Detailed Solution

To cross the river, the man takes $= \frac{1 k m}{4 k m / h} = \frac{1}{4} h$

During this time, the river takes him down stream by $\frac{3 k m}{h} \times \frac{1}{4} h = \frac{3}{4} k m = 750 m$ .

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