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一根同时点两头,另外一根点一头,等点两头的烧完了,同时点燃另一根的另一头,燃尽的时间就是45分钟了。

visitor1111 (皮卡丘)
(#300816@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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