SOLUTION: If a plane can fly 480 mph with the wind and 400 mph against the wind. What is the speed of the plane in still air?

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Question 1016840: If a plane can fly 480 mph with the wind and 400 mph against the wind. What is the speed of the plane in still air?

Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
x= speed of the plane in still air, in mph;
y= wind speed, in mph.
Then,
x%2By=480= speed of the plane with the wind, in mph, and
x-y=400= speed of the plane against the wind, in mph.
Adding up both equations, we get
x%2By%2Bx-y=480%2B400
x%2Bx=880
2x=880
x=880%2F2
highlight%28x=440%29