Compare the motion of two trains. Which train was moving at a higher speed?

 - a train that moved 635kilometers in 5hours
 - a train that moved 605kilometers in 5hours
Look at the distance each train moved and the time it took to move that distance.
One train moved 635 kilometers in 5 hours.
The other train moved 605 kilometers in 5 hours.
Notice that each train spent the same amount of time moving. The train that moved 635 kilometers moved a farther distance in that time. So, that train must have moved at a higher speed.