One Mile on the globe Puzzle-Asked in Amazon interviews.


How many points are there on the globe where by walking one mile south, one mile east and one mile north you reach the place where you started?

Solution: Infinite Points

The north pole is one such place.However, consider the points 1 + 1/(2*pi) miles away from the south pole. Call point A any of these (infinite number of) points. Go a mile south to point B. When you go a mile east, you end up back at point B (you travelled once through every line of longitude). A mile north then brings you back to point A.There are points still closer to the south pole such that going a mile east brings you through each line of longitude exactly twice, three times, or as many times as you want. Thus we have an infinite number of concentric rings of infinite numbers of points, and we can start a mile north of any of them.

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