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vuk03800
2 năm trước
Một con đò dọc đưa khách từ đầu nguồn đến cuối nguồn, nghỉ 30 phút để đón khách rồi quay lại đầu nguồn, tổng thời gian đi và về là 4 giờ 30 phút. Hãy tìm tốc độ của con đò khi nước yên lặng, biết tốc độ của nước chảy là 5 km/giờ.
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