Compare the motion of two buses. Which bus was moving at a higher speed?

 - a bus that moved 450kilometers in 10hours
 - a bus that moved 550kilometers in 10hours
Look at the distance each bus moved and the time it took to move that distance.
One bus moved 550 kilometers in 10 hours.
The other bus moved 450 kilometers in 10 hours.
Notice that each bus spent the same amount of time moving. The bus that moved 550 kilometers moved a farther distance in that time. So, that bus must have moved at a higher speed.