I think people don't have time to read all this...they just think they've solved it, read a few of the posts, and post their reply.

Its hard to imagine taking the time to absorb the important concepts...and missing it.

My wife and kids got it figured out in about 30 seconds.

I asked the receptionist, (1 minute 23 seconds to solve) who replied she had NO idea what made a jet move...I told her it sucked air in one end, added fuel, and blew hot exhaust out the back to push the plane forward...

She said..."I guess it would go forward like a balloon, when you let go of a ballon knot".

I said "What would the conveyor do to it?"

She said "Nothing I guess, the conveyor would just spin the tires - how would that stop the plane from moving?"