City B is north of City A, and the 400 mile trip by car takes 8 hours. The cities are 320 miles apart in a straight line. What is the velocity of a trip from City A to City B?

City B is north of City A, and the 400 mile trip by car takes 8 hours. The cities are 320 miles apart in a straight line. What is the velocity of a trip from City A to City B?