题目信息
Working at a constant rate, a copy machine makes 20 copies of a one-page document per minute. If the machine works at this constant rate, how many hours does it take to make 4,800 copies of a one-page document?
A:4
B:5
C:6
D:7
E:8
参考答案及共享解析

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已选答案:
正确答案:
A:4
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