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Introduction to Statistics

A boy can swi...

Question

A boy can swim in still water at $1 m / s$ . He swims across a river flowing at $0.6 m / s$ which is $336 m$ wide. If he travels in shortest possible time, then what time he takes to cross the river

A

420 s

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B

250 s

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C

340 s

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D

336 s

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Solution

The correct option is D $336 s$
Given,

$v_{m r} = 1 m / s$

Shortest possible time to cross the river is:

$t = \frac{w}{v_{m r}} = \frac{336 m}{1 m / s}$

$= 336 s$

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