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A river is flowing from west to east at ...

A river is flowing from west to east at a speed of ` 5 metres per minute` . A man on the south bank of the river , capable of swimming at `10 metres per minute`, in still water , wants to swim across the river in the shortest time . He should swim in a direction

A

due north

B

` 30 (@)` east of north

C

` 30 (@) ` west of north

D

`60(@)` east of north

Text Solution

Verified by Experts

The correct Answer is:
A
Time taken to cross the river ` t =( d)/(v_(s) cos theta)`
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