This a problem that was found on a contest from 1996.
Two swimmers start out from opposite ends (red side and blue side) of a pool. They cross each other for the first time at line PO which is 32 yards from the red side. They reach the opposite ends, turn around and cross again at line RS which is 18 yards from the blue side. Assuming that thye both travel at constant speeds, how many yards is it from the red side to the blue side?