Two ropes burning riddle 45 minutes


You have two ropes and a lighter. Each rope has the following property: If you light one end of the rope, it will take one hour to burn to the other end. They don’t necessarily burn at a uniform rate. How can you measure a period of 45 minutes?


  1. Light up three out of four ends of the two wires.
  2. Once one wire is completely burnt, light up the fourth end.
  3. At 45 minutes, both wires are burnt completely.