GMAT
题目
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 fewer hours does it take all five machines, operating simultaneously, to fill the same production order?
解析
4台机器完成的总工作量 = \( 30 × 4 = 120 \)单位
增加1台机器后，每台机器需要工作的时长为：\( 120 ÷ 5 = 24 \)小时
时长差 = \( 30 - 24 = 6 \)小时
答案：C
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