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qn24873
2 năm trước
Một người đi xe máy từ A đến B với vận tốc 30 km/h .Khi đi từ B về A người đó với vận tốc 40 km/h , do đó tổng thời gian cả đi lẫn về là 5 giờ 15 phút . Tìm quãng đường AB.
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