A bus uses 1 gallon of diesel for every 6 miles traveled. The relationship between the amount of diesel left in the gas tank, p gallons, and the distance traveled, q miles, can be represented by the equation q=96-6p. How many gallons of diesel are left after the bus has traveled 42 miles. After the bus has traveled 48 miles, how much farther can the bus travel before it runs out of diesel?