Dave and Sandy Hartranft are frequent flyers with a particular airline. They often fly from City A to City​ B, a distance of 900 miles. On one particular​ trip, they fly into the​ wind, and the flight takes 2 hours. The return​ trip, with the wind behind​ them, only takes 1 and one half
hours. If the wind speed is the same on each​ trip, find the speed of the wind and find the speed of the plane in still air.