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A man can swim with speed …

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A man can swim with speed of 4km/hr in still water. How long does he take to cross a river 1km wide if the river flows steadily at 3km/hr and he makes his strokes normal to the river current?

Posted by Nikita Jain 3 years ago

CBSE > Class 11 > Physics

1 answers

Ankit Kumar Sain 3 years ago

Solution verified Verified by Toppr Since he makes his strokes normal to the river current, the movement of the river will have no effect on the time of crossing the bank. The time will be, T= Speed Distance = 4 1 hr=0.25hr=15min. In the same time, he will go down by Distance=Speed x time=3km/hr x 0.25hr=0.75km=750m

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