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Posted by: G.Paul Bradley (GPaulBrad@aol.com) on 4/09/1998@20:22hrs:
Two Staten Island ferries started at the same time from opposite sides of the river, traveling across the water on routes at right angles to the shores. Each ferry traveled at a constant speed, though their two speeds were different. They passed at a point 720 yards from the nearer shore. Both ferries remained at their slips for ten minututes before starting back. On the return trips, they met 400 yards from the other shore. How wide was the river?