Did you solve it? Are you smart enough to work for Elon Musk?
by Alex Bellos from Science | The Guardian on (#60T8M)
The answers to today's planetary perplexities
Earlier today I set you the following problem, which was Elon Musk's favourite interview question for engineers applying to work at SpaceX (according to his biographer Ashlee Vance).
You're standing on the surface of the Earth. You walk one mile south, one mile west and one mile north. You end up exactly where you started. Where are you?
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