Question

A river is flowing from west to east at a speed of `5m//s`. A man on the south bank of the river capable of swimming at `10m//s` in a still water wants to swim, across the river in a 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

Answer 1

Correct Answer - A
For shortest time, one should at right angles to river current.