Here's The Logic Puzzle
The Two Burning Ropes Brain Teaser
You might even second guess the solution, but it's logical.To measure 45 minutes with these two ropes, you should first light both ends of one rope. At the same time, only light one end of the second rope. When the first rope is completely burned up, 30 minutes will have elapsed. At this point, you should then light the other end of the second rope. Because there are 30 minutes left of burn time on this rope, lighting the other end will cut that time in half, leaving you with 15 minutes of burn. Overall, you will have burned through both ropes in 45 minutes.
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