Help!I need,Be quick有一个蓄水池及甲乙丙三个放水管,加单独放水12小时可把水池注满,乙单独放水16小时可把水池注满,丙单独排水15小时可把满池水排完,现甲乙两管同时开6小时,关闭乙管,打开丙

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