Question

A man can swim with a speed of 4 kilometre per hour in stillwater how long does it take to cross the river one ride in the river flows steadily at 3 km per hour and he makes is normal to the river current

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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Answer 2

Speed of the man who can swim is ,

vm = 4 km per hour

Width of the river = 1 km

Time taken to cross the river

= Width of the river/ speed of the river

= 1/4 hour

=15 minute

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 metre