An airplane is preparing to land at an airport. It is feet above the ground and is descending at the rate of feet per minute. At the same​ airport, another airplane is taking off and will ascend at the rate of feet per minute. When will the two airplanes be at the same altitude and what will that altitude​ be? Use pencil and paper. Use two other methods to solve the problem. Explain which methods are easier to use and which are more difficult to use for the situation.