题目信息
Five machines at a certain factory operate at the
same constant rate. If four of these machines,
operating simultaneously, take 30 hours to fill a certain
production order, how many $$\underline{fewer}$$ hours does it take
all five machines, operating simultaneously, to fill the
same production order?
A:3
B:5
C:6
D:16
E:24
参考答案及共享解析

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已选答案:
正确答案:
C:6
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