Ferry Boat Solution Two ferry boats ply the same route between ports on opposite sides of a river. They set out simultaneously from opposite ports, but one is faster than the other, so they meet at a point 720 yards from the nearest shore. When each boat reaches its destination, it waits 10 minutes to change passengers then begins its return trip. Now the boats meet at a point 400 yards from the other shore. How wide is the river? http://www.wolframalpha.com/input/?i=%28d-720%29%2F720%3D%28720%2Bd-400%29%2F%28d-720%2B400%29 A graphic solution in Python is at ferry.py A solution from Math Central |