To calculate the average speed of a car, we divide the total distance traveled by the total time taken.
Average Speed = Total Distance / Total Time
In this case, the car traveled a distance of 150 kilometers in 2.5 hours.
Average Speed = 150 km / 2.5 h
To simplify the calculation, we divide 150 by 2.5:
Average Speed = 60 km/h
Therefore, the average speed of the car is 60 kilometers per hour.