# SOLUTION: A plane flies 500 miles with the wind and 340 miles against the wind in the same length of time. If the speed of the wind is 20 mph, what is the speed of the plane in still air?

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 Question 452379: A plane flies 500 miles with the wind and 340 miles against the wind in the same length of time. If the speed of the wind is 20 mph, what is the speed of the plane in still air?Answer by jorel1380(2518)   (Show Source): You can put this solution on YOUR website!500/s+20=340/s-20 340(s+20)=500(s-20) 340s+6800=500s-10000 16800=160s s=105 The still air speed of the plane is 105 mph..