John can chop a cord of wood in 4

题目

John can chop a cord of wood in 4.5 hours. Phil can do the same job in 3 hours. Working together, they make $45 to chop a cord of wood. If each takes home an amount of pay in proportion of the amount of work he performed, how much does Phil make on one cord of wood?

选项

解析

### 解答：约翰的工作时长 = 4.5小时菲尔的工作时长 = 3小时总工作量 = 45单位约翰的工作效率 = 10单位/天菲尔的工作效率 = 15单位/天两人合作完成工作所需的总时间 = $ \frac{45}{25} = \frac{9}{5} = 1.8 $小时约翰的工作量 = 18单位菲尔的工作量 = $ 15×1.8 = 27 $单位答案：27单位

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