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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 two ropes. Each rope takes exactly 60 minutes to burn completely.
However, the ropes do not burn at a uniform speed. For example, half the rope might burn in 5 minutes while the other half takes 55 minutes.
You also have a lighter.
How can you measure exactly 45 minutes?
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