Science: Number-Juggling

A group of sportsmen, having pitched camp, set forth to go bear hunting. They walk 75 miles due south, then 75 miles due east, where they sight a bear. Bagging their game, they return to camp and find that altogether they have traveled 45 miles. What was the color of the bear?

This sounds like a nonsense riddle, but it isn't. The only place on earth from which you can walk 15 miles south, then 15 miles east, and still be only 15 miles from the starting point, is the North Pole. Hence the bear must have been a polar bear—therefore white.

The...

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