The daily charge is $2.50 for the first hour
then $1.25 for each additional hour or part therefo
So, 3.5 hours means $2.50 (first hour) + $2.50 (second and third hour) + $1.25 (for 1/2 hour) for a total of $6.25
so $39.00 ÷ $6.25 = 6.24
any number of visits above 6 will be less costly if a weekly pass is purchased