Fwam's car used 1/30 of a gallon to travel 1 1/2 miles. At what rate does the car use gas, in miles per gallon?

Can some one me with these questions

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.

Raymond just got done jumping at super bounce trampoline center. the total cost of his session was $43.25 . he had to pay a $7 entrance fee and $1.25 for every minute he was on the trampoline. write an equation to determine the number of minutes (t) that raymond was on the trampoline.