Question 987262
An airplane travels 
5175km
 against the wind in 
9
 hours and 
6075km
 with the wind in the same amount of time. What is the rate of the plane in still air and what is the rate of the wind?
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Find the 2 groundspeeds, upwind and downwind.
The plane's airspeed is the average of the 2.
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The windspeed is the difference between airspeed and groundspeed.