Respuesta :
We are given with the information about the cost of gasoline per gallon and the rate of which gallon is consumed in terms of miles per gallon.In order to calculate the total cost to drive, the needed information is the total miles mother has driven all throughout.
Answer:
The distance between the two cities
While we know the cost of the gallons and the amount of miles per gallon, we do not know how far away each city is from each other.