The Return of the most infamous HB thread of all time... :D

[Tishimself]

But there is a set speed... HOw fast is your treadmill? 6 minute mile or 10 minute mile? and remember, the treadmill is only one mile long, then off into the abyss...

What does the treadmill represent? the rotation of the earth?

There is no set speed for the treadmill. It can go as fast as it needs to in order to counter any forward movement of the plane. Remember, the moment the wheels start turning faster than the treadmill, the plane will move, once they are spinning at the same speed, the plane will stop. Since the wheels will not ever be able to spin faster than the treadmill, the plane can not move. As for what it represents. Nothing. Its just the instrument used to illustrate this version of the question.