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A boat 'B' is moving upstream with veloc...

A boat `'B'` is moving upstream with velocity `3m//s` with respect to ground. An observer standing on the boat observes that a swimmer `'S'` is crossing the river perpendicular to the direction of motion of the boat. If river flow velocity is `4m//s` and swimmer crosses the river of width `100,m` is `50s`. Then

A

velocity of swimmer w.r.t ground is `sqrt(13)m//s`

B

drift of swimmer along river is zero

C

drift of swimmer along river will be `50m`

D

velocity of swimmer w.r.t grond is `2m//s`

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The correct Answer is:
A
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