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英语翻译A rectangular tank measuring 60cm by 40cm is half filled

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英语翻译
A rectangular tank measuring 60cm by 40cm is half filled with wateer.If tap A is turned on,it will take 6 minutes to fill the remaining half of the tank .Tap B drained water from the tank at a rate of 12 liters per minutes.How long will it take for the tank to filled to 1/8 of the tank if both taps are turned on at the same time?
一个60cm*40cm的长方体容器装满一般水,如果打开水龙头A,将会用6分钟的时间将容器填满,水龙头B在容器下面以每小时12升的速度往外排水.问如果同时打开两个水阀,将会用多长时间才能填满容器的1/8?