Wire/Rope Burn Problem
How do we measure forty-five minutes using two identical wires, each of which takes an hour to burn? We have matchsticks with us. The wires burn non-uniformly. So, for example, the two halves of wire might burn in 15 minutes and 45 minutes respectively
Solution
- You can measure 30 minutes by burning the rope from both sides
- Burn another Rope for 30 minutes and then start burning thatrope from both sides to measure 15 minutes