A commercial airplane that is 1{,}5001,5001, comma, 500 miles into a 2{,}5002,5002, comma, 500-mile journey is traveling at 450450450 knots in still air when it picks up a tailwind of 150150150 knots (in the same direction). If hhh is the number of hours remaining in the airplane's flight, which of the following equations best describes the situation