BTW in engineering/science when somebody talks about the speed of something, especially something that spins or rotates as well as displaces, they generally are talking about the speed of the centroid of the object. The speed of the wheels' centroid is the same as the speed of the plane, because they are attached to the plane at their centroid (approximately - but very close). They didn't say "surface speed" or rotatiomal speed" in the question. So the conveyor is moving at the speed of the plane in the opposite direction, so the wheels would be spinning twice as fast with this magical conveyor as they would normally.
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