1 one person running around a circle, after 300feet return to the start point, ask how much is the radius?
I.) 150/pei
II.) 60/Pei
III.) 25/pei
=> I.III
确认
我觉得就是I.) 150/pei，如何又出来个III？应该就跑了一圈啊。作者: tongxun 时间: 2003-2-4 22:19
300 feet is the distance, thus there may be 6 circles this person had run.
Therefore, III is also the right answer作者: steven.wei 时间: 2003-2-4 23:22
thank TONGXUN
我知道为什么错了，“one person running around a circle”，脑子中选入了一个a circle错觉，所以就僵化在这里了，ETS太坏了作者: tongxun 时间: 2003-2-4 23:23
you are always welcome!
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