Firstly if anyone knows the answer to this dont spoil it as ive seen it go over 200 pages on other forums lol
scroll down now
Rolling Runway.
A plane is standing on a runway that can move (some sort of band conveyer). The plane moves in one direction, while the conveyer moves in the opposite direction.
This conveyer has a control system that tracks the plane speed and tunes the speed of the conveyer to be exactly the same (but in the opposite direction).
Can the plane take off?