You have two ropes that each burn in exactly 60 minutes, but unevenly. How do you measure 45 minutes?
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You have two ropes, each taking exactly 60 minutes to burn completely but burning unevenly along their length. Using only these ropes, how do you measure exactly 45 minutes?
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You have two ropes, each taking exactly 60 minutes to burn completely but burning unevenly along their length. Using only these ropes, how do you measure exactly 45 minutes?
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Light both ends of rope one and one end of rope two at the same time. When rope one finishes burning (30 minutes), light the second end of rope two — it will then finish in another 15 minutes, totaling 45.
