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anhtranvan2304
2 năm trước
Bài 1: Người thứ nhất làm một mình có thể làm xong việc trong 25 ngày, người thứ 2 trong 20 ngày, người thứ 3 trong 24 ngày. Cả 3 người cùng làm trong 2 ngày, sau đó chỉ còn người thứ 3 làm trong 6 ngày. Phần việc còn lại người thứ nhất và người thứ tư cùng làm với người thứ 3 bốn ngày mới xong. Hỏi nếu người 4 làm một mình thì sau bao lâu xong công việc? Bài 2: Hai vòi nước cùng chảy vào bể thì sau $\frac{6}{5}$ giờ sẽ đầy bể. Nếu một mình vòi thứ nhất chảy thì sau 2 giờ sẽ đầy bể. Hỏi một mình vòi thứ 2 chảy thì sau bao giờ đầy bể
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