Question 369009
Flying with the wind, a plane can fly 800 miles in 2 hours. Against the wind the plane can fly the same distance in 4 hours. Find the rate of the plane in calm air and rate of the wind
------------------
The airspeed of the plane is the average of its upwind and downwind groundspeeds.
--------------
The windspeed is the difference between the airspeed and the groundspeed.