题目

Two journalists have 8 hours in which to copy edit a total of 100 articles. If Journalist A copy edits at a steady rate of 3.5 articles per hour, how many articles per hour must Journalist B copy edit in order to complete the assignment on time?



选项

A.

12.5

B.

9

C.

8

D.

4.5

E.

3

解析

要计算记者A的工作量,需用效率乘以时间:\(R \times t = W = 3.5\) 篇/小时 × 8小时 = 28篇 因此,记者B需要校对的文章数量为 \(100 - 28 = 72\) 篇。要计算记者B的效率,只需将72代入工作量公式求解: 对于B的效率:\(R_B \times 8\) 小时 = 72,因此效率为9篇/小时。
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