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
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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](/uploads/image/z/12471140-20-0.jpg?t=%E8%8B%B1%E8%AF%AD%E7%BF%BB%E8%AF%91three+pipes+a+%2Cb+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)
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
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
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?