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There are 4 card-processing machines in an office....

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[单项选择题]There are 4 card-processing machines in an office. The fastest of these machines processes x cards in 7 hours and the slowest processes x cards in 8 hours. Which of the following could NOT be the average time per machine for each of the 4 machines to process x cards ?()

关键词: machines cards processes

A.7.2
B.7.3
C.7.5
D.7.6
E.7.7

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