Question 823927
Miles East: 3+13=16
Miles West: 5
Total Distance moved is 16+5=21, but relative distance is 16-5=11 to the east of the starting point.


21*miles*(1*gallon/(40*miles))=21/40 gallons used for all the movement.  Slightly more than half a gallon used.


You did not say the capacity of the gasoline tank.  Some cars have a 16 gallon tank.  This means (1/4) full is 4 gallons.  The driver has plenty of fuel for the trip.  If 4 gallons of fuel was in the tank, then using slightly more than half gallon leaves more than 3 gallons still in the tank after the trip.