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标题: 求助 PP CR之一第20題 [打印本页]

作者: chasechase12 时间: 2010-10-11 17:24
标题: 求助 PP CR之一第20題
請問各位, 要怎麼解釋呢?

作者: starchang14 时间: 2010-10-11 17:27
能不能贴个题上来啊?

作者: chasechase12 时间: 2010-10-12 15:27
抱歉抱歉, 補上題目:

For years the beautiful Rena buildings in pa have been damaged by exhaust from the many tour buses that came to the city. There has been little parking space, so most buses have idled at the curb during each stop on their tour, and idling produces as much exhaust as driving. The city has now provided parking that accomodates a third of the tour buses, so damage to pa's buildings from the buses' exhaust will diminish significantly.

問support

答案是 Tour buses typically spend less than one-quarter of the time they are in pa transporting passengers from one site to another.

怎麼解釋呢??

作者: chasechase12 时间: 2010-10-12 15:37
還有一題pp:

one machine seals K cartons in 8 hours, the other machine seals K cartons in 4 hous; if the two machines together sealed a number of cartons, what percent of the cartons were sealed by the machine working at the faster rate?

答案是66.6%

以上請教各位, 感謝!!

作者: chasechase12 时间: 2010-10-12 20:31
自頂~~

作者: 优之菡萏 时间: 2010-10-13 00:22
路程上释放尾气过多导致污染毁坏BUILDING，答案为减少四分之三的时间在路上，这样尾气自然就少了……于是支持

作者: 优之菡萏 时间: 2010-10-13 00:25
同样的时间，FASTER产出是slower的两倍,假设他们一起8小时，侧faster产出2K，slower产出K，一共是3K，2除以3你会算吧……

作者: chasechase12 时间: 2010-10-13 09:13
謝謝解答～

作者: jenny0827 时间: 2010-10-13 14:36

抱歉抱歉, 補上題目:

For years the beautiful Rena buildings in pa have been damaged by exhaust from the many tour buses that came to the city. There has been little parking space, so most buses have idled at the curb during each stop on their tour, and idling produces as much exhaust as driving. The city has now provided parking that accomodates a third of the tour buses, so damage to pa's buildings from the buses' exhaust will diminish significantly.

問support

答案是 Tour buses typically spend less than one-quarter of the time they are in pa transporting passengers from one site to another.

怎麼解釋呢??

-- by 会员 chasechase12 (2010/10/12 15:27:56)

这是07pp还是08pp, 具体哪题?

正文的逻辑链是：因为停车位少，t bus到站后只能停在路边挂空档，空档和行驶产生废气一样多，所以造成污染，结论是因为停车位可容纳1/3t bus，所以污染可以减少

答案好另类哦，差点没想明白：t bus通常花在行驶上的时间少于1/4，就是说挂空档的时间占3/4强，停车位多一些的话就可以减少空档时产生的废气，而这些废气是主要污染源，所以最终可以减少废气对城市的污染！太阴险了！

作者: talentzou 时间: 2020-6-20 12:21

chasechase12 发表于 2010-10-12 15:37
還有一題ppne machine seals K cartons in 8 hours, the other machine seals K cartons in 4 hous; if t ...

假设 seals K cartons in 8 hours的叫 A, seals K cartons in 4 hours的叫B
A和B一起工作8小时，A能产出K cartons， B能产出2K cartons，共3K cartons；
其中B产的更快，问B产出的占比？ 2K/3K = 0.666 = 66.6%

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