1 người đi từ A đến B. Nếu người này đi với vận tốc 18km/h thì đến B sớm 6 phút. Còn đi với vận tốc 12km/h thì đến B trễ 6 phút. Hỏi người này phải đi với vận tốc bao nhiêu để đến B đúng giờ?

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