Make a web page.

It should ask how much fuel you burn per hour.  No plane burns less than 0 gallons per hour.
It should ask how much fuel is in the plane.  My plane holds no more than 22 gallons of fuel.  No plane holds less than 0 gallons.
It should ask the speed of the plane.  My plane cannot go slower than about 45 mph.  It cannot go faster than 115 mph.
It should print the total range I can travel before refueling.
It should print the total time needed to exhaust the tanks.
It should have a picture of a 1966 model Cessna 150.