A MAN TAKES HIS DOG for a walk in the park. He walks around a circular pond, which takes him exactly an hour. (It’s a very big pond.) He has a stick which he throws for the dog, which the dog retrieves and brings back to him without breaking its run (it’s a very well-trained dog). The dog runs at 10 miles an hour. If the man wants the dog to get the maximum amount of exercise, should he throw the stick in front of him, behind him, or across the other side of the pond?
See the answer
It doesn’t make any difference.
The dog keeps running for as long as the man keeps walking. The man walks for an hour, in which time the dog runs 10 miles – no matter in which direction the man throws the stick.
