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2 năm trước
Một xe lửa đi từ a lúc 6 giờ 45 phút để đến b với vận tốc 40,5 km h dọc đường xe luôn nghỉ tại các ga hết 36 phút hỏi xe lửa đến b vào lúc nào biết rằng quãng đường AB dài 97 km 200 m
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