FOOD FOR THOUGHT

Brainteaser

The Time Traveler’s Meeting. Two time travelers wish to meet. They agree to visit each other alternately, starting on the first day of the month. One travels every third day (i.e., on the 1st, 4th, 7th, etc.), and the other every fourth day (i.e., on the 1st, 5th, 9th, etc.). On which days of the month will they meet?

Want to read this article?

Subscribe to access Deep Dive articles, book reviews, podcasts, Ask the Founder, and access to our members-only forum.

Become a Member

Already a subscriber? Sign in