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hochocnuahocmai250902
2 năm trước
một ô tô đi từ a đến b với vận tốc 50km/h, lúc về ô tô đi với vận tốc 60kmh nên thời gian về ít hơn thời gian đi là 30 phút. Hỏi quãng đường AB dài bao nhiêu km?
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