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Question

A man can swim with a speed of 4 kmh1 in still water. He crosses a river 1 km wide that flows steadily at 3 kmh1. If he makes his strokes normal to the river current, how far down the river does he go 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
850 m
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Solution

The correct option is C 750 m
Time to cross the river, t=Width of riverSpeed of man+1km4kmh1
=14h
Distance moved along the river in time t,
s=vr×t=3kmh1×14h
=34km=750m

1069240_940482_ans_e0e350f6431542939fcac78e8780b11c.PNG

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