Final answer:
The car's average velocity is 62.5 mi/h, calculated by dividing the distance of 250 miles by the time of 4.0 hours.
Step-by-step explanation:
The average velocity of a car can be determined by dividing the total distance traveled by the total time taken. In this case, the car travels 250 miles in 4.0 hours. To calculate the average velocity, we use the formula:
Average velocity (vavg) = Total distance / Total time
vavg = 250 mi / 4.0 h = 62.5 mi/h
Therefore, the car's average velocity is 62.5 miles per hour (mi/h).