A swimmer wants to cross a river which is flowing at a speed ' $v$ '. If the swimmer can swim in still water…
A swimmer wants to cross a river which is flowing at a speed ' $v$ '. If the swimmer can swim in still water at speed ' $\mathrm{V}$ ', the direction he should swim to cross the river in least time is
Along the flow of river
Opposite to the flow of river
Perpendicular to the flow of river
$45^{\circ}$ to the flow of river
Solution
If the swimmer wants to cross the river in least time than he must swim perpendicular to the flow of the river.