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没看明白题目啊，例子3:55怎么算的啊？

Posted by myi_i at 2005-07-06 16:21:19 on Problem 2467 
例子那条路最长也就20＋5＋15（14.1）~=40啊
最多时间40/20+40/50也到不了3小时啊。

老大们给提示一下吧，谢谢。
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