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trinhquocthinh190
2 năm trước
1 người đi bộ 15 phút vs vận tốc 4,5km/h. sau đó người đó lên ô tô đi tiếp 1 giờ 45 phút vs vận tốc48km/ giờ. hỏi người đó đi quãng đường dài bao nhiêu km?
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