how to get it?

A man on a boat is located at point B on the waters, 200 meters from point A on the shoreline. Line segment AB is perpendicular to the shoreline. He can swim at the rate of 3 m/s and walks along the shoreline at 5 m/s. The man needs to get to a point along the shoreline which is 400 meters from point A. How far from point A must the man lands (end of his swim), then walks along the shoreline to his destination, so that the total time of swimming and walking is minimum