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hancucnan
2 năm trước
Một ô tô đi từ A đến B. Cùng lúc đó cũng có một xe máy đi từ B về A với vận tốc bằng 4/5 vận tốc ô tô. Sau 4 giờ chúng gặp nhau. Thời gian ô tô đi hết quãng đường AB đó là ..... giờ.
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