Math word problem How much money do you get to save homework help

Math word problem How much money do you get to save homework help

If your car gets 25 mpg at 60 mph but increases to 30 mpg at 50 mph, how many gallons of gas would you save on the 1200 mile trip at the lower speed? If gas costs $2.10 a gallon, how much money do you save?

Please discuss how you arrived at your answer.