FOOD FOR THOUGHT

Brainteaser

A ladder hangs over the side of a ship anchored in port. The bottom rung touches the water. The distance between rungs is 20 cm and the length of the ladder is 180 cm. The tide rises at a rate of 15 cm per hour. After 4 hours, how many rungs are under water?

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