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趣题6答案:如何计时1小时15分钟,15分钟是个难点。由于烧一根不均匀的绳从头烧到尾就是1个小时,而15分钟刚好是1小时一半的一半,从这个角度去思考,就能解决问题了。方法如下:同时点燃两根绳子A和B,A只点一头,B点两头;等B燃完了(也就过了半小时了),立即把A的另一头点起,此时开始计时,当A燃完后(从计时开始刚好15分钟),立即再点燃一根绳子C,C只点一头,等C燃完后,从计时开始刚好1小时15分钟。因为是不规则绳子,所以不能截成2段。
Question 6 Answer: How to time 1 hour and 15 minutes, 15 minutes is a difficult task. Since burning a non-uniform rope from scratch to the end is 1 hour, and 15 minutes is just half the 1 hour, from this perspective to think, we can solve the problem. The method is as follows: Simultaneously light two ropes A and B, A only one, B two; until B is over (also over half an hour), immediately A point up the other end, then start timing, when A burned (exactly 15 minutes from the start), and then immediately lit a rope C, C only one, and so on C burning finished, just from the start of time 1 hour and 15 minutes. Because it is irregular rope, it can not be cut into two paragraphs.