Quote:
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...but the treadmill is made to match the forward speed of the plane, only in the opposite direction. So, as the plane moves forward, it moves backwards beneath the aircraft.
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There are two interpretations for this. Both are possible, but neither is specified by the provided information.
#1: If the "forward speed" is defined as relative to the treadmill then the plane is stationary relative to the air.
#2: If the "forward speed" is defined as relative to the ground, then it is possible for the plane to be in motion relative to the air.
Nothing in the question rules out either of these interpretations, and no amount of blustery hoopla or physics masturbation can change that.
The question is unanswerable as stated. It's designed that way on purpose.