A man who swims at a speed of `5km//h` wants to cross a `500m` wide stream flowing at `4km//h` and reach the point which is directly opposite to his starting point. If he reaches a point somewhere else he has to walk back to desitination, his walking speed being `2km//h`. Find the minimum time in which he can reah his destination.

Options

A. 5 min
B. 10 min
C. 15 min
D. 20 min

Answer

B