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Quãng đường từ A đến B là 1 khúc sông dài 143km, vận tốc dòng nước là 6km/giờ. 1 ca nô từ A xuôi dòng về B, 1 ca nô khác xuôi dòng về A, 2 ca nô khởi hành lúc 7 giờ, vận tốc của mỗi ca nô là 26km/giờ. Hỏi đến mấy giờ 2 ca nô gặp nhau ? Help meeeee
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