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先把第一根两头点燃,半小时燃完。记下终燃点,从对应位置及任一端点燃第二根,燃尽时就是四十五分钟。

pyramid (金字塔)
(#300812@0)
2001-12-16 -04:00
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Back To Topic: 也出一题, 给你二根导火索, 每根可各燃1小时, 但燃烧速度不一定均匀, based on this, 请测出45分钟来.

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