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How can the swan get out of the lake and take flight before the dog gets him?

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A swan is in the center of a circular lake but he cannot take flight from the water, only on land. On the parameter of the lake there is a hunting dog that desperately wants to eat the swan but cannot swim. So the swan must make it to the land before taking off and must do so before the dog makes it to him. The dog is almost 4 times faster than the swan and always runs to the point around the lake closest to the swan.

How can the swan get out of the lake and take flight before the dog gets him?

posted Jun 24, 2014 by Amarvansh

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1 Solution

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The swam exhausts the dog by swimming small circles around the center of the lake. The dog has to run all around the lake to stay closest to the swam. Once the dog is exhausted the swam can swim to the shore and take off.

solution Mar 31 by Jcm



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