Question

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

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

Distance covered with flow of the river = vr × t

= vr × t = 3× 1/4 = 3/4 km

= 3/4 × 1000 = 750 m

I hope, this will help you

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