Question 1035329
Against the wind a commercial airline in South America flew 784 miles in 4 hours.  With a tailwind the return trip took 3.5 hours.  What was the speed of the plane in still​ air?  What was the speed of the​ wind?
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The plane's airspeed is the average of the 2 groundspeeds, upwind and downwind.
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Windspeed is the difference between airspeed and groundspeed.