2. 外语
  3. 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

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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