Question

A man can swim with a speed of 4.0 km/h in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0 km/h and he makes his strokes normal to the river current? How far down the river does he go when he reaches the other bank?

Answer 1

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Speed of the man,

vm = 4 km/h

Width of the river = 1 km

Time taken to cross the river

= Width of the river/ speed of the river

= 1/4 h

=15 min

Speed of the river, vr = 3 km/h

Distance covered with flow of the river = vr × t

= 3× 1/4 = 3/4 km

= 3/4 × 1000 = 750 m

Distance covered with flow of the river = vr × t

I hope, this will help you

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