题目信息
Each machine at a toy factory assembles a certain kind
of toy at a constant rate of one toy every 3 minutes.
If 40 percent of the machines at the factory are to be
replaced by new machines that assemble this kind
of toy at a constant rate of one toy every 2 minutes,
what will be the percent increase in the number of
toys assembled in one hour by all the machines at the
factory, working at their constant rates?
A:20%
B:25%
C:30%
D:40%
E:50%
参考答案及共享解析
共享解析来源为网络权威资源、GMAT高分考生等； 如有疑问，欢迎在评论区提问与讨论
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正确答案：
A:20%
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