Compare the motion of three cars. Which car was moving at the highest speed?

 - a car that moved 150kilometers south in 5hours
 - a car that moved 330kilometers east in 5hours
 - a car that moved 250kilometers north in 5hours
Look at the distance each car moved and the time it took to move that distance. The direction each car moved does not affect its speed.
Notice that each car moved for 5 hours. The car that moved 330 kilometers moved the farthest distance in that time. So, that car must have moved at the highest speed.