A man crosses a `320m` wide river perpendicular to the current in `4` min. If in still water
Channel: Doubtnut
Date: 2020-08-16

A man crosses a `320m` wide river perpendicular to the current in `4` min. If in still water he can swim with a speed `5//3` times that of the current, then the speed of the current, in `m//min` is