Một ô tô chạy hết quãng đường AB trong 3 giờ.Giờ thứ nhất ô tô chạy được\(\dfrac{2}{5}\)quãng đường AB.Giờ thứ hai ô tô chạy được \(\dfrac{2}{5}\)quãng đường còn lại và thêm 4 km.Giờ thứ ba chạy nốt 50 km cuối.Tính vận tốc trung bình của ô tô đó trên quãng đường AB?

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