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2 năm trước
Một ô tô chạy từ tỉnh A đến tỉnh B. Trong nửa đoạn đường đầu, xe chuyển động với vận tốc 40km/h. Trong nửa đoạn đường sau, xe chuyển động với tốc độ 60km/h. Hỏi tốc độ trung bình của ô tô trên cả quãng đường AB bằng bao nhiêu ?
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