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烧一根不均匀的绳,从头烧到尾总共需要1个小时。现在有若干条材质相同的绳子,问如何用烧绳的方法来计时1小时15分钟呢
It takes a total of 1 hour to burn an uneven rope and burn it from beginning to end. There are several ropes of the same material. Ask how to use the method of roasting to time 1 hour and 15 minutes.