Situation

This discussion will center around the following situation. Torty and Harry are competing in a 100m footrace. Torty's average speed on any 5-second interval is always less than Harry's average speed on any 5-second interval, but Torty wins the race!

Additional Details

The race will be at least 10 seconds long, but you can make the race last longer if you wish. For consistency, let's say Torty and Harry keep running after 100 meters, so their speeds can always be calculated by looking forward in time even though the race ends at 100 meters. Also, neither Torty nor Harry ever moves backward during the race.