Compare the motion of two speedboats. Which speedboat was moving at a lower speed?

 - a speedboat that moved 460miles in 10hours
 - a speedboat that moved 555miles in 10hours
Look at the distance each speedboat moved and the time it took to move that distance.
One speedboat moved 460 miles in 10 hours.
The other speedboat moved 555 miles in 10 hours.
Notice that each speedboat spent the same amount of time moving. The speedboat that moved 460 miles moved a shorter distance in that time. So, that speedboat must have moved at a lower speed.