Final answer:
The car's average speed was 54 miles per hour, calculated by dividing the total distance (162 miles) by the total time taken (3 hours).
Step-by-step explanation:
The car left point A at 7:30 am and arrived at point B, 162 miles away at 10:30 am. To calculate the average speed in miles per hour, you divide the total distance by the total time it took to travel that distance.
Time taken = 10:30 am - 7:30 am = 3 hours
Therefore, Average Speed = Total Distance / Total Time
Average Speed = 162 miles / 3 hours = 54 miles per hour.
So, the car's average speed was 54 miles per hour.