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

 - a blue whale that moved 75miles in 10hours
 - a blue whale that moved 100miles in 10hours
Look at the distance each blue whale moved and the time it took to move that distance.
One blue whale moved 75 miles in 10 hours.
The other blue whale moved 100 miles in 10 hours.
Notice that each blue whale spent the same amount of time moving. The blue whale that moved 75 miles moved a shorter distance in that time. So, that blue whale must have moved at a lower speed.