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maiphuong10062003
2 năm trước
Trên quãng sông AB dài 162,5 km, thuyền máy đi xuôi dòng từ A đến B với vận tốc 30 km/giờ; ca nô đi ngược dòng từ B về A với vận tốc 35 km/giờ. Tính thời gian ca nô và thuyền máy gặp nhau. Điểm gặp nhau cách B bao xa?
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