A car and a van are driving on a highway. The table shows the amount y (in gallons) of gas in the car's gas tank after driving x miles. The amount of gas in the van's gas tank after driving x miles is represented by the equation y=−112x+40. Which vehicle uses less gasoline per mile? How many miles must the vehicles travel for the amount of gas in each gas tank to be the same? Car
Miles traveled, x Gallons of gas in tank, y
60 15
120 13
180 11
240 9

The amount of gas in each tank is the same after _ miles.