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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

我的名片

gugeren

注册日期: 2012-01-06
访问总量: 3,059,800 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

敬告：您的浏览器已关闭活动脚本，开启后才可正常使用！

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评论：

趣味的数学 - 31

趣味的数学 - 31

Andy 正午驾车出发，以匀速在A镇与B镇之间来回行驶。

Bob 也是在正午驾车出发，以40千米/小时的速度，在B镇与A镇之间与Andy车子行驶的相同公路来回行驶。

Andy 在与Bob 两车首次交会后的20分钟到达B镇，Bob 在两车首次交会后的45分钟到达A镇。

问：两车第n次交会在什么时间？

【提示：

找出第二次两车交会与第一次两车交会相距的时间，以及第三次与第二次两车交会相距的时间，……，从而找出第n次与第n-1次两车交会相距时间的模式。】

【转引自Edward J. Barbeau等编著的“Five hundred Mathematical Challenges”第118题。】