英语翻译three pipes a ,b and c can fill a tank in 6 hours .after

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英语翻译
three pipes a ,b and c can fill a tank in 6 hours .after working at it together for 2 hours .c is closed and a and b can fill the remaining part in 7 hours .the number of hours taken by c alone to fill the tank is

三管A,B和C可以在6小时内充满一个水箱.
在一起工作2小时后,C关闭,A和B用7个小时可以充满剩余的部分.
单独的由C来填充,要几小时?

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