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Shortest Time Problem
A dog fetches a ball thrown into a lake. Because the dog swims more slowly than it runs on sand, the shortest time path is not a straight line. You can drag the image of the dog to vary the path.



"Shortest Time Problem" from The Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/ShortestTimeProblem/
Contributed by: Oleksandr Pavlyk
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