Một ô tô dự định chuyển động từ A đến B với vận tốc 30km/h. Nhưng sau khi đi được 1/3 đoạn đường, xe bị chết máy. Tài xế phải dừng 30 phút để sửa xe, sau đó đi tiếp vơi vận tốc 40km/h và đến B đúng giờ qui định. Tính tốc độ trung bình của ô tô trên quãng đường AB
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