Question

A man can swim with a speed of 4.0 km h-1 in still water. How long does he take to cross a river 1.0 km wide if the river flows steadily at 3.0

Answer 1

Answer:-

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 = 1 × 60 / 4 = 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 × 1000 / 4

= 750 m

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Answer 2

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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

I hope, this will help you

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