How to answer Elon Musk's favourite job interview question

SpaceX CEO Elon Musk likes to ask one riddle in particular when interviewing candidates for a position with his company, according to the book “Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future.”

The question has two answers — one simple, and one slightly more complicated. Here’s the question — and the answers. Do you have what it takes to work for Musk?

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