A Sam Lloyd classic puzzle has two ferry boats starting at the same instant from opposite sides of a river, traveling across the water at right angles to the shores. They travel at constant, but possibly different speeds. The boats pass at a point 720 yards from the nearest shore. Both boats dock for 15 minutes, to discharge and receive passengers, before heading back. On their return trips they meet again, 400 yards from the other shore.
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bonanova
A Sam Lloyd classic puzzle has two ferry boats starting at the same instant from opposite sides of a river, traveling across the water at right angles to the shores. They travel at constant, but possibly different speeds. The boats pass at a point 720 yards from the nearest shore. Both boats dock for 15 minutes, to discharge and receive passengers, before heading back. On their return trips they meet again, 400 yards from the other shore.
How wide is the river?
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