three towns x, y, and z are on a river which flows uniformly. y is equidistant from x and z. if a boats man rows from x to y and back in 10 hours and x to z in 4 hours, find the ratio of speed of the boats man in still water to the speed of the current.

three towns x, y, and z are on a river which flows uniformly. y is equidistant from x and z. if a boats man rows from x to y and back in 10 hours and x to z in 4 hours, find the ratio of speed of the boats man in still water to the speed of the current.