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标题: 烧绳子again[:)] [打印本页]

作者: ob 时间: 2004-12-7 23:47
标题: 烧绳子again[:)]

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一个小时十五分钟？

作者: 123 时间: 2004-12-8 00:14
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作者: ob 时间: 2004-12-9 03:01
标题: Your answer is right. But takes too long to

measure the time

If use same way but with different sequence, you can measure 1hour 15min directly:

1. Light two ends of rope 1 and light one end of rope 2

2. Light one end of rope 3 when rope 1 is totally burned out

3. Light the other end of rope 3 when rope 2 is burned out.

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