首页/ 题库 / [单选题]师徒共同完成一批零件。徒弟4小时完成这批的答案

师徒共同完成一批零件。徒弟4小时完成这批零件的,师傅2小时完成这批零件的,师徒二人同时合作,多少时间可完成这批零件?(  )。

单选题
2021-07-17 21:12
A、9小时
B、9<img width="13" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/2c2638eb-a93f-4e1c-af70-4c888635b524.png" />小时
C、9<img width="13" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2016-08-19/c21d1538-b509-4d0b-bff0-db05805f32aa.png" />小时
D、10小时
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正确答案
C

试题解析

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