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this is right, while 金字塔's is not, coz the burning rate is not JunYun
tongbuyong
(通不用)
(#300822@0)
Last Updated: 2001-12-16
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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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