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Nganth
2 năm trước
3. Một xe máy đi từ A lúc 6 giờ 20 phút và đến B lúc 8 giờ. Giữa đường người đó nghỉ 10 phút. Hỏi nếu không kể thời gian nghỉ, xe máy đó đi quãng đường AB hết bao lâu? 5. Có hai vòi nước cùng chảy vào một bể không có nước. Nếu vòi 1 chảy riêng thì sau 4 giờ sẽ đầy bể. Nếu vòi 2 chảy riêng thì sau 6 giờ sẽ đẩy bể. Hỏi cả hai vòi cùng chảy thì sau bao lâu sẽ đầy bể?
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