This is a free photo. Read the following: Do your home work so that you won't have to miss a Porsche car payment and you will be able to calculate how long it takes to run out of fuel. 5 gallons of fuel will last 2 hours. You have 15 gallons. How long will it take to run out of fuel if you are on an 8 hour flight to London, England to speak to Mr. Mellon about North American genocide? Answer the f-;+;+king Question Jimmy boy!!