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. If the second rope burns from both ends just as the first rope starts to burn from both ends, both ropes will burn out in 30 minutes.If the second rope burns from both ends just AFTER the first rope burns out, it'll take 30 minutes more to burn out.
#You have to burn the rope no burn how to
A time less than 45 minutes is measured in the first step of burning one rope.Ĭhallenge is now, how to burn the unused second rope to measure 15 minutes more. The rope will burn in 30 minutes, not in 1 hour. So, no rope can be burned from only one end.įrom the two conclusions, decide the first action,Ĭonclusion 3 on action Step 1: Burn one rope from both ends simultaneously. On further analysis, make the second key conclusion,Ĭonclusion 2: As burning a rope from only one end will burn it in one hour, target time of 45 minutes will be exceeded. Solution to the two burning ropes timer riddle: Step by step reasoningįrom the information, draw the first key conclusion on what cannot be done,Ĭonclusion 1: As the ropes burn at non-uniform rates along the length, each rope can be burned only from the ends. Only saving grace is the allowance that one or both of the ropes can be burned simultaneously at multiple points.
That's why you cannot just measure a point at three-fourth of the length of a rope and start burning at that point to measure 45 minutes. The ropes are of same length but none of the two burns at a uniform rate throughout the length. Continued abuse of our services will cause your IP address to be blocked indefinitely.Measure a time of 45 minutes by burning two ropes each of which takes 1 hour to burn out. Please fill out the CAPTCHA below and then click the button to indicate that you agree to these terms. If you wish to be unblocked, you must agree that you will take immediate steps to rectify this issue. If you do not understand what is causing this behavior, please contact us here. If you promise to stop (by clicking the Agree button below), we'll unblock your connection for now, but we will immediately re-block it if we detect additional bad behavior.
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