# send the function the fuel efficiency rating (miles per gallon or liters per 100km) and it will convert it to the other.

def UKtoUSA(litres): #liters per 100km to MPG
    answer = litres/100
    answer = answer * 1.609344
    answer = 1/answer
    answer = answer * 3.785411784
    return answer


def USAtoUK(miles): #MPG to liters per 100km
    answer = miles / 3.7854
    answer = 1/answer
    answer = answer / 1.609344
    answer = answer * 100
    return answer