Question

Parking in a student lot costs $3 for the first half hour and $1.50 for each hour thereafter. A partial hour is charged the same as a full hour. What is the longest time that a student can park in this lot for $10.

Answer 1

For this question, it's easier to solve if you set up an equation:
so the total cost is
$10 = $1+ $1.50(t) where t=# hours
so solving this, you get
$9 = $1.5t
t = 6 hrs