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tranthingocanh05112002
2 năm trước
Hai vòi nước cùng chảy vào một cái bể không có nước thì sau 12 giờ đầy bể. Nếu chỉ mở vòi thứ nhất trong 4 giờ rồi mở vòi thứ hai chảy trong 6 giờ thì chỉ được 2/5 bể. Hỏi nếu chỉ mỗi vòi chảy thì mất bao lâu sẽ đầy bể
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