Cameron takes a road trip. He starts from his home in the suburbs of Cleveland, OH, and travels to Pittsburgh, PA, to visit his aunt and uncle. The distance Cameron drives from Cleveland to Pittsburgh is 133 miles, and the trip takes him 2 hours. The amount of gasoline in Cameron's car is 9 gal after he drives for 2 hours. The amount of gas g in gallons in his tank varies inversely with the amount of time t in hours he spends driving. Write the equation of the inverse variation. Then, use this equation to find the number of gallons in Cameron's tank after 5 more hours of driving.