Originally Posted by TonyC

The question is not too vague, and it has only one answer.

Read the second sentence very carefully. I'll highlight the important words.






An airplane does not apply thrust through its wheels, so the conveyor is nothing more than a cute (and impossibly expensive) distraction. Airplane accelerates to 60 mph, the conveyor accelerates to 60 mph in the opposite direction. (The question as posed requires that the conveyor move at the same speed, but opposite direction, as the airplane. If the airplane is stationary, then the conveyor isn't moving either.) Wheels turn at 120 mph, and the airplane flies.



- Tony C

The truth only hurts if it should.