When should we light up the second rope at its other end?įact: The only known point of time to burn the other end is when the first rope burns out.Ĭonclusion 8: This is when we must start to burn the other end of the second rope. So continue to reason based on knowledge gained till now.Ĭonclusion 7: As a rope cannot be burned only from one end, the second rope must be burned from its other end as well. This is the second breakthrough achieved by step by step reasoning.īut solution not yet reached. No way 45 minutes target can then be met.Ĭonclusion 6 on action Step 2: Burn the second rope only at one end simultaneous to burning the first rope at both ends. So,Ĭonclusion 4: The second rope must burn only from one end.Ĭonclusion 5: Burning of the second rope cannot start AFTER the first rope burns out. In both infeasible actions, the second rope burns from both ends.
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