Question 993954
Christie pilots her plane for 300 mi against a headwind in 2 hrs. The flight would take 1 hr and 30 mins with a tailwind of the same speed. Find the Headwind and the speed of the plane in still air. 
----------------
find the 2 groundspeeds, upwind and downwind.
The plane's airspeed is the average of the 2.
The windspeed is the difference between airspeed and groundspeed.
============
We don't need this: 

The speed of the headwind on the plane is ___mph and the speed of the plane in still air is ___mph.