Question

The airport garage charges ​$5 to park for the first hour and then ​$3.50 an hour for any additional hours. Ben paid ​$57.50 to park there one day when he flew to another city. How many hours was he parked at the airport?

Answer 1

This is a linear function. Total charge = $57.50 = $5 + ($3.50)x

Then $52.50 = ($3.50)x, and x = ($52.50) / ($3.50) = 15.

Ben parked there for 15 hours.