25) travel time you want to visit your aunt !
who lives 255 miles away. the interstate is 10
miles from your house and once you get off
the interstate, you must travel 14 miles more
to get to your aunt's house. if you drive 55
miles per hour on the interstate, how many
hours will you travel on the interstate?

Let A be the total distance to your Aunt, who is 255 miles away.
Let B be the distance from getting off the interstate to your aunt.
Let C be the distance from your house to the interstate.

The question asks how many hours you will be traveling on the interstate.

There:
= A - B - C
= 255 - 10 - 14
= 231

If you drive 55 miles per hour, then you divide the distance on the interstate by speed you drive on the interstate :
= 231 ÷ 55
= 4.2 hours