OK. Our department at college has a question... none of us are science teachers. A tractor and cart, all with different sized wheels, which travels fastest? The answers are available are for any of the wheels ( smallest to biggest) or for all being the same? My argument is, if the tractor is moving at say 20mph then all the wheels are moving at 20mph? I'm sure this is an easy question for this forum. I did search buit couldnt find anything this low level.