A tourist purchases a car in England and ships it home to the United States. The car sticker advertised that the car's fuel consumption was at the rate of 40 miles per gallon on the open road. The tourist does not realize that the U.K. gallon differs from the U.S. gallon:

1 U.K. gallon = 4.545 9631 liters

1 U.S. gallon = 3.785 306 0 liters.

For a trip of 750 miles (in the United States), how many gallons of fuel does

(a) The mistaken tourist believe she needs and

(b) The car actually requires?