Working together, Jeff and Ashley painted their apartment in 6 hours

题目

Working together, Jeff and Ashley painted their apartment in 6 hours. If Jeff had been working alone, he could have painted the whole apartment in 10 hours. How many hours would it have taken Ashley to paint the apartment alone?

选项

解析

杰夫和艾希莉一起粉刷公寓需要6小时。如果杰夫单独粉刷，他可以在10小时内完成整个公寓的粉刷。那么艾希莉单独粉刷公寓需要多少小时？已知：\( \frac{1}{J} + \frac{1}{A} = \frac{1}{6} \) 同时，杰夫单独粉刷整个公寓需要10小时，因此： \[ \frac{1}{10} + \frac{1}{A} = \frac{1}{6} \] \[ \frac{1}{A} = \frac{1}{6} - \frac{1}{10} = \frac{4}{60} = \frac{1}{15} \] \[ A = 15 \] 艾希莉单独粉刷公寓需要15小时。答案：C

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