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gugeren的博客
有则写之，无则空之
	https://blog.creaders.net/u/5804/ > 复制 > 收藏本页

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gugeren

注册日期: 2012-01-06
访问总量: 3,059,916 次

· 【美国时事通】当被捕杀者成为猎

· 【RRN】白帽逮捕一宾夕法尼亚州

· 【RRN】军方将清洗叛国军官

· 【RRN】FBI局长Wray被控叛国罪但

· 【美国时事通】川普胜选后，她要

· 【RRN】海军陆战队逮捕马约卡斯

· 【美国时事通】911，J6等真相将

【DIY】

【数学】

【美国大学申请】

· 美国劳工部对2010-2020年劳动力

【杂记】

【股票+金融】

【自己文章】

【转贴好文章】

· 【RRN】FBI局长Wray被控叛国罪但

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发表评论

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评论：

趣味的数学 - 9

趣味的数学 - 9

某人正在一座铁路桥上。桥的两端分别是A点和B点。此人离A点的距离是铁路桥长的3/8。

他听到一列火车正向A点驶来。火车速度是80千米/小时。

如果他此时跑向A，他将于火车在A处相遇；如果他跑向B处，火车将在B处追上他。

假设他奔跑的速度是匀速的，求他的速度。

【转引自Edward J. Barbeau等编著的“Five hundred Mathematical Challenges”第329题。】