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ltvy1122
2 năm trước
có hai vòi nước chảy vào bể không có nước. Vòi thứ nhất chảy một mình thì đầy bể trong 3 giờ, vòi thứ hai chảy một mình thì đầy bể trong 5 giờ. Hỏi cả hai vòi cùng chảy thì trong bao lâu đầy bể nước?
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