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A man can swim with a speed of 4 km h^...

A man can swim with a speed of 4 km `h^(-1)` in still water. He crosses a river 1 km wide that flows steadily at 3 km `h^(-1)`. If he makes his strokes normal In the river current, how far down the river does he go when he reaches the other bank ?

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(a) time taken `t=(AB)/(v_(m))=(1)/(4)hr=15` min.
(b) The distance travelled along the river during its crossing is
`BC=v_(R)xxt=3xx(1)/(4)=0.75km`
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