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Kieuphung
2 năm trước
3 xe tải xuất phát cùng 1 lúc từ A đến B. Vận tốc xe thứ nhất là 50km/h. Vận tốc xe thứ 2 là 48km/h. Xe thứ 3 đến B muôn hơn xe thứ nhất 36' và sớm hơn xe thứ 2 1h24'. Vận tốc xe thứ 3 là? Cần gấp, ai nhanh hứa tick! Cảm ơn!
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