How To Solve Elon Musk’s Favorite Riddle – 1 Mile South, 1 Mile West, 1 Mile North

I’m somewhere on earth. I walk one mile south, one mile west, and one mile north. I end up exactly where I started. Where am I?

This puzzle is a classic brain teaser that was asked at Microsoft. It is also one of the favorites of Elon Musk, co-founder of PayPal and Tesla Motors.

This problem appears in my book Math Puzzles Volume 1 (nearly 5 stars on 9 ratings) which contains many interesting brain teasers and math riddles:

See the solution in a blog post –

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I learned about this puzzle from William Poundstone’s book “How Would You Move Mount Fuji” which is a collection of many interesting puzzles that were asked at Microsoft.

My Books

“The Joy of Game Theory” shows how you can use math to out-think your competition. (rated 4/5 stars on 23 reviews)

“The Irrationality Illusion: How To Make Smart Decisions And Overcome Bias” is a handbook that explains the many ways we are biased about decision-making and offers techniques to make smart decisions. (rated 5/5 stars on 1 review)

“Math Puzzles Volume 1” features classic brain teasers and riddles with complete solutions for problems in counting, geometry, probability, and game theory. Volume 1 is rated 4.5/5 stars on 11 reviews.

“Math Puzzles Volume 2” is a sequel book with more great problems.

“Math Puzzles Volume 3” is the third in the series.

“40 Paradoxes in Logic, Probability, and Game Theory” contains thought-provoking and counter-intuitive results. (rated 4.9/5 stars on 7 reviews)

“The Best Mental Math Tricks” teaches how you can look like a math genius by solving problems in your head (rated 4.7/5 stars on 3 reviews)

“Multiply Numbers By Drawing Lines” This book is a reference guide for my video that has over 1 million views on a geometric method to multiply numbers. (rated 5/5 stars on 1 review)

Click here to get this post in PDF

Steve (15)

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