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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 =1 km4 km/h=14h During this time, the river takes him down stream by3 kmh×14h=34km=750 m .

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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?