If three water pipes A, B and C are working at the same time, they can fill a swimming pool in 6 hours, if only A and B work, it

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问题 If three water pipes A, B and C are working at the same time, they can fill a swimming pool in 6 hours, if only A and B work, it needs 8 hours to fill the swimming pool, in how many hours can C fill the swimming pool alone?

选项 A、22
B、24
C、12
D、21
E、10

答案B

解析 A、B、C三个水管一起开需要6个小时,A、B一起开需要8个小时,假设C单独工作需要C小时,那么:1/8+1/C=1/6,C=24,选择B。
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