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[Problem Solving]

试题详情

题目:

A company has two types of machines, type R and type S. Operating at a constant rate, a machine of type R does a certain job in36 hours and a machine of type S does the same job in 18 hours. If the company used the same number of each type of machine to do the job in 2 hours, how many machines of type R were used?

选项:

A、3
B、4
C、6
D、9
E、12

答案:

C

提问:

这道题是怎么做的?没有太理解题意,既然两台机器的速度不一样,数量怎么会一样呢?

解答:

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解答: 徐小梅

提问:

这道题是怎么做的?没有太理解题意,既然两台机器的速度不一样,数量怎么会一样呢?

解答:

点赞0
阅读557
解答: 徐小梅老师

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