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bolttuthan
2 năm trước
Hai vòi nước cùng chảy vào 1 bể sau 12h thì đầy. Nếu cả hai vòi cùng chảy trong4h ròi cho vòi 1 nghỉ vòi 2 chảy trong 10 giờ thì đầy bể. Hỏi nếu mỗi vòi chay 1 mình thi bao lâu đầy bể?
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