Final answer:
The average speed of the car that travels 150 miles in 2.5 hours is found using the formula (total distance ÷ total time), resulting in an average speed of 60 miles per hour.
Step-by-step explanation:
To calculate the average speed of a car, we need to use the formula:
average speed = total distance ÷ total time
Here, the car travels 150 miles in 2.5 hours. To find its average speed in miles per hour, we divide the distance by the time:
150 miles ÷ 2.5 hours = 60 mph
Therefore, the car's average speed is 60 mph, which corresponds to option (a) 60 mph.