2. 外语
  3. A time-study specialist has set the production rate for each worker on a certain job at 22 units every 3 hours. At this rate wha

A time-study specialist has set the production rate for each worker on a certain job at 22 units every 3 hours. At this rate wha

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问题 A time-study specialist has set the production rate for each worker on a certain job at 22 units every 3 hours. At this rate what is the minimum number of workers that should be put on the job if at least 90 units are to be produced per hour?
选项 A、5
B、8
C、12
D、13
E、30
答案D
解析 一位时间研究专家确定某项工作的生产速度是每人每3小时生产22件。在这个速度下，若每小时最少生产90件，问需要多少工人参加工作?
解：本题的正确答案为(D)。生产的速度为每人每小时22/3件，故每小时生产90件需要：90÷22/3 ≈ 12.2≈13人，显然12个人是无法完成每小时至少90件的工作，所以共需要13个工人参加工作。
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