Compare the motion of two birds. Which bird was moving at a higher speed?

 - a bird that moved 5miles in 10hours
 - a bird that moved 40miles in 10hours
Look at the distance each bird moved and the time it took to move that distance.
One bird moved 40 miles in 10 hours.
The other bird moved 5 miles in 10 hours.
Notice that each bird spent the same amount of time moving. The bird that moved 40 miles moved a farther distance in that time. So, that bird must have moved at a higher speed.