Question

A person can swim with a speed of 10 m/s w.r.t river which is flowing at a speed of 5 m/s. The time taken by the person in crossing the river in minimum time will be (width of river = 200 m)....PLZ answer fast

Answer 1

The time taken by the person is 40 seconds.

Explanation:

Given that,

Velocity of the person, v = 10 m/s

Velocity of the river, u = 5 m/s

Width of river, d = 200 m

Let t is the time taken by the person in crossing the river in minimum time. Te relative velocity between the person and river is, v' = 10 - 5 = 5 m/s

Time,

$t=\dfrac{d}{v'}$

$t=\dfrac{200\ m}{5\ m/s}$

t = 40 s

So, the time taken by the person is 40 seconds. Hence, this is the required solution.

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Topic : Relative velocity

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