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Question

A man can swim with speed of 4 kmph in still water. He crosses 1 km wide river making strokes normal to river current. The river flows steadily at 3 kmph. How far down the river, he drifts when he reaches the other bank?

A
500 m
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B

600 m

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C
750 m
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D
1000 m
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Solution

The correct option is C 750 m
Motion is two dimensional

Time taken to cross the river
t=w(vm)r=1 km4 km/h=14 h
In this time river will carry man downwards
D=vr×t=3×14=34 km=750 m

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