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A man can swim with a speed 4km/hr in st...

A man can swim with a speed 4km/hr in still water.
(a) How long does he takes to cross a river 1 km wide if the river flows steadily at 3 km/hr and makes his strokes normal to the river current?
(b) How far down the river does he go when he go when he reaches the other bank?

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The correct Answer is:
15 min , 750 m
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