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Burning Ropes Timer
This Hard puzzle in the “logic” category rewards careful reading and step-by-step reasoning. Use the hint if you are stuck, then compare your approach with the explained answer.
You have 2 ropes. Each rope takes exactly 60 minutes to burn completely.
However, the ropes do not burn at a uniform speed. One half of a rope might burn in 5 minutes, while the other half could take 55 minutes.
You also have a lighter.
How can you measure exactly 45 minutes?
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