Acar left point a at 7: 30 am and arrived at point b, 162 miles away at 10: 30 am. what was its average speed in miles per hour?

Let's find the amount of time in between.
3 hours are in between.
The amount of minutes in 3 hours are 180 minutes.
The car travels 162 miles in 180 minutes.
162 miles:180 minutes
x miles    : 60 minutes
Let's divide 162 by 3
54 miles  : 60 minutes.
It travels an average of 54 miles per hour.