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英语翻译Please find the best answer for the following logistic q

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英语翻译
Please find the best answer for the following logistic question and briefly describe the key steps.There are some ropes that are different in length,weight and quality.They will equally cost exactly 1 hour to burn up from the beginning to the end.The question is how to find out 45 minutes and the minimum number of ropes you need to burn?Describe the key steps.
请找出下列逻辑性问题的最佳答案并且简要描述关键步骤:有一些长度、重量、质量均不同的绳子.他们从头燃烧至尾都恰好需要一小时.问题如下:如何弄明白45分钟是多长?(我的理即通过数根绳子燃烧判断45分钟是个多久的时间段)最少需要燃烧多少根绳子?