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gaptaolaban
2 năm trước
1 người đi xe ô tô đi từ A đến B với vận tốc 50km/h. Sau khi đến B và nghỉ lại ở đó 30 phút, người đó lại đi từ B về A với vận tốc giảm bớt 10 km/h. Tổng thời gian cả đi lẫn về là 5 giờ 54 phút (kể cả thời gian nghỉ lại ở B) Tính quảng đường AB
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