Question 1166213
A European Swallow flies into the wind from the castle of Uther Penn Dragon to Camelot while carrying a coconut.  He flies 28 miles to Camelot in 2 hours, delivers the coconut and retrieves an identical coconut to carry back to the castle.  He travels back the same distance (now with a tail wind) in 1.5 hours.  What is the air speed of the laden swallow?  What is the velocity of the wind?
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The groundspeed upwind is 28/2 = 14 mi/hr
The groundspeed downwind is 28/1.5 = 56/3 mi/hr
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The airspeed is the average of the 2 speeds, = 98/3 mi/hr
The windspeed is the difference between airspeed and either groundspeed.
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PS  If the coconuts are identical, what's the point of the trip?