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nguyenducnhatminh2006
2 năm trước
một con tàu chạy ngược dòng 60km ,sau đó chạy xuôi dòng 48km trên cùng 1 dòng sông có vận tốc dòng nước là 2km/h .Tính vân tốc của con tàu tuần tra khi nước yên lặng, biết thời gian xuôi dòng ít hơn thời gian ngược dòng 1 giờ [giúp e với e vote 5 sao cho]
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