Problem 2 (The Ripple Problem)

John is paddling across a lake in his canoe when directly ahead of him a fish jumps out of the water creating a circular ripple which moves outward at a constant rate. Exactly 10 seconds after the fish jumps John paddles across the ripple coming towards him and after 20 seconds he crosses the ripple going in the same direction. How long after the fish jumps does John cross the spot in the water where the fish jumped ?

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Last modified on Tuesday, January 12, 1999