快考了~~求救一道PREP....

云彩雨 · 发表于 2011-5-2 21:11:19

5.1353-!-item-!-187;#058&000886

Working alone at its own constant rate, a machine seals k cartons in 8 hours, and working alone at its own constant rate, a second machine seals k cartons in 4 hours.If the two machines, each working at its own constant rate and for the same period of time, together sealed a certain number of cartons, what percent of the cartons were sealed by the machine working at the faster rate?

那位NN能帮忙翻译下问题...

sdcar2010 · 发表于 2011-5-2 21:25:45

This is a no brainer.

If one machine works twice as fast as another machine, then the faster one will seal twice as many products as the slower one. Thus if both work for the same period of time, 2/3 of the products are produced by the faster one.

charles1987 · 发表于 2011-5-2 21:27:02

挺简单的工作效率的问题。

两台机器工作效率恒定，（为了方便先叫A,B)好了。
A 机器密封K个箱子用8 小时，B 封K个箱子用4小时。如果两台机器以这样的速率一起工作同样时间去封一定数量的箱子，那么工作效率高的那台机器所密封的箱子将会是百分之多少？

HOPE IT HELPS

云彩雨 · 发表于 2011-5-2 21:32:32

thanks~~~

快考了~~求救一道PREP....

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