Answer:
3.75 miles
Step-by-step explanation:
You want to have a formula for the "distance to the destination" as a function of the time, let's call it d(t). Given is that d(0)=60, and you are interested in d(2.5).
d(t) = 60 - 22.5t will do the trick.
d(2.5) = 60 - 22.5*2.5 = 3.75
