Compare the motion of two blue whales. Which blue whale was moving at a higher speed?

 - a blue whale that moved 45miles in 5hours
 - a blue whale that moved 55miles in 5hours
Look at the distance each blue whale moved and the time it took to move that distance.
One blue whale moved 55 miles in 5 hours.
The other blue whale moved 45 miles in 5 hours.
Notice that each blue whale spent the same amount of time moving. The blue whale that moved 55 miles moved a farther distance in that time. So, that blue whale must have moved at a higher speed.