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Number 有若干根不均匀的绳子,每根绳子点燃一头的烧完时间是一个小时,用什么方法确定一段1小时15分钟的时间 请回答最少需要几根绳子 Uneven Ropes Lit End Burn

Front 有若干根不均匀的绳子,每根绳子点燃一头的烧完时间是一个小时,用什么方法确定一段1小时15分钟的时间? (请回答最少需要几根绳子) There are a number of uneven ropes, each rope lit end of the burn out time is an hour, what method is used to determine a section of 1 hour and 15 minutes? (Please answer the minimum number of ropes needed)
Back A 1.
B 2.
C 3.
D 4.

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