How to answer Elon Musk's favorite 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 ." 

Here's the question and the answer so you can test whether or not you have what it takes to work for him.

Produced by Chris Snyder

Follow TI:On Facebook

Join the conversation about this story »