Problem
The Problem
You have two ropes. Each burns end-to-end in exactly 60 minutes, but the burn rate is non-uniform (e.g., the first half might burn in 10 minutes and the second in 50). You have matches.
How do you measure exactly 45 minutes?
You have two ropes. Each burns end-to-end in exactly 60 minutes, but the burn rate is non-uniform (e.g., the first half might burn in 10 minutes and the second in 50). You have matches.
How do you measure exactly 45 minutes?