Compare the motion of two mountain bikers. Which mountain biker was moving at a higher speed?

 - a mountain biker who moved 165kilometers in 5hours
 - a mountain biker who moved 135kilometers in 5hours
Look at the distance each mountain biker moved and the time it took to move that distance.
One mountain biker moved 165 kilometers in 5 hours.
The other mountain biker moved 135 kilometers in 5 hours.
Notice that each mountain biker spent the same amount of time moving. The mountain biker who moved 165 kilometers moved a farther distance in that time. So, that mountain biker must have moved at a higher speed.