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Smart moves

A vicious dog was tied to a tree with a five meter rope. Khaled wanted to go back to his car, but the car was only two meters away from the tree. The dog was following Khaled?s every move. How could Jack safely reach his car?

Since the dog was following every move he made, Jack began circling the tree. After several revolutions the rope became shorter, and thus the dog no longer could reach the car.
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