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2 năm trước
Lúc 6 giờ 15 phút một người đi xe đạp từ A về B với vận tốc 12km/giờ, lúc 6 giờ 30 phút một người đi bộ từ B về A với vận tốc 4 km/giờ; hai người gặp nhau lúc 8h. Hỏi quãng đường từ A về B dài bao nhiêu km?
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