Judy recently took a trip in her car. The trip took13hours, including a lunch break of1/2hour. At the beginning of the trip, she filled the gasoline tank(with12.4gallons)and noted that the odometer read38,227.8miles.At the end of the trip, she refilled the tank(with13.5gallons),and the odometer read38,632.3miles.She paid$3.42 9/10 per gallon.

a.) How many miles per gallon did the car get on the trip (to the nearest tenth of a mile per gallon)?

b.) What was the cost (in dollars) of the gas used during the trip? (Round your answer to the nearest cent.)

c.) What was her average speed in miles per hour? (Round your answer to one decimal place.)