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

 - a humpback whale that moved 20kilometers in 5hours
 - a humpback whale that moved 40kilometers in 5hours
Look at the distance each humpback whale moved and the time it took to move that distance.
One humpback whale moved 20 kilometers in 5 hours.
The other humpback whale moved 40 kilometers in 5 hours.
Notice that each humpback whale spent the same amount of time moving. The humpback whale that moved 20 kilometers moved a shorter distance in that time. So, that humpback whale must have moved at a lower speed.