![]() This is same as burning the rest half-life of the second rope from both ends simultaneously. Result of last action: Other end of the second rope lighted up just as the first rope burns out in 30 minutes. Significance of burning the second rope from the other end just as the first rope burns out, In 30 minutes more, rest of the second rope will be burned out.The burning point is still alive in the second rope and is moving towards its opposite end.30 minutes burn time of second rope still left. Half the full burn time of 1 hour of the second rope is spent. 30 minutes half-life of the second rope and NOT ITS HALF LENGTH burns out.What happens when the second rope starts to burn first time from one end simultaneous to burning first rope from both ends? To be sure, let us examine burning the second rope in more details. ![]() This is an intriguing riddle where the solution is reached by finding the ONLY FEASIBLE course of action, though we do not know yet how 45 minutes will elapse after the actions are taken. Though reason says, there cannot be any other way 45 minutes can be measured, we are not satisfied. 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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