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A swimmer wishes to reach directly opposite bank of a river, flowing with velocity 8 m/s. The swimmer can swim 10m/s in still water. The width of the river is 480m. Time taken by him to do so

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a swimmer wishes to reach directly opposite bank of a river flowing with a velocity of 8m/s. the swimmer can swim 10m/s in still water. the width of the river is 480m. time taken by him to do so is
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a swimmer wishes to reach directly opposite bank of a river flowing with a

a swimmer wishes to reach directly opposite bank of a river flowing with a velocity of 8m/s. the swimmer can swim 10m/s in still water. the width of the river is 480m. time taken by him to do so is

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asked Jun 19, 2017 by sharma689561



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we know that v=D/t

 

Swimmer can swim with  velocity of 10m/s

River flowing with velocity of 8 m/s

Total width =480m

Therefore √(V)²-(u)²=480/t

√(10)²-(8)²=480/t

√100-64=480/t

6t=480/t

t=80 sec