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标题: 求探讨milepost这道CR题目,论坛上没搜到,脑子短路了实在想不明白,谢谢! [打印本页]

作者: carandl    时间: 2014-7-26 00:45
标题: 求探讨milepost这道CR题目,论坛上没搜到,脑子短路了实在想不明白,谢谢!

此题如何解释?实在想不明白。。。谢谢各位!
A milepost on the towpath read "21" on the side facing the hiker as she approached it and "23" on its back. She reasoned that the next milepost forward on the path would indicate that she was halfway between one end of the path and the other. However, the milepost one mile further on read "20" facing her and "24" behind.
Which of the following, if true, would explain the discrepancy described above?
(A) The numbers on the next milepost had been reversed.
(8) The numbers on the mileposts indicate kilometers, not miles. f
(C) The facing numbers indicate miles to the end of the path, not miles from the beginning.
(D) A milepost was missing between the two the hiker encountered.
(E) The mileposts had originally been put in place for the use of mountain bikers, not for hikers.
作者: lsy103759    时间: 2014-7-31 14:15
文章大意:有个人在双向路走,碰到了两方向的里程碑分别是21和23,他自己走的那个方向的里程数是21.然后他就觉得走到下一个里程碑就到中点了(双向路的里程数都是22,相等时就是中点嘛)可是他遇到的下一英里的里程碑是20和24,他自己走的那个方向里程数是20.

C 的意思是这个人面对的里程标示的距离终点的英里数而不是距离起点的英里数
也就是说标示着22的两个里程碑已经走过了,在21和23之前就遇到了。(没有图不知道说清楚没,脑补一下高速公路的样子吧。。。)
而这个人接下来在自己走的那个方向将遇到的里程碑是19,18,17,16....3,2,1,0
相反方向的里程碑是25,26,27....42,43,44


D 两个里程碑之间有个里程碑被漏掉了
人走的方向的里程碑是21,20,另一个方向写的是23,24.
如果有漏掉里程碑,那么人走的方向的数字应该在20-21,另一个方向的数字应该在23-24。那也不会遇到相同的数字。
而且文章说了是一英里以后的里程碑。更不对了

A:下一处里程碑的数字写反了(20和24反了)
那人走的方向:21之后一英里的里程碑是24.相反方向:23之后一英里的里程碑是20
不对。
作者: carandl    时间: 2014-7-31 14:32
lsy103759 发表于 2014-7-31 14:15
文章大意:有个人在双向路走,碰到了两方向的里程碑分别是21和23,他自己走的那个方向的里程数是21.然后他 ...

十分感谢!我知道这道题靠文字解释十分十分长,但你还是写出来了,很清楚~谢谢!




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