Question

A man can swim with a speed of 4km/h in still water. How long does he take to cross a river 1 km wide

Answer 1

Let time taken = x

D = s/t

1 = 4/t

t = 1/4 hrs

 = 15 min

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

I hope, this will help you

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