Sure it is. We only know the average speeds, but we don't know

how much of the time each car drove faster or slower.

The averages only tell us who got to the end of their trip sooner.

But there could have been a time ... or several times during the hour ...

when the 55mph car was blazing and passed the 65mph car.

In fact, the 55mph car could have been driving at 110 mph for the

first 29 minutes, then the last 1.83 miles at a speed of 3.5 mph.

His average would then be 55mph, even though he spent the first

29 minutes passing everybody and everything on the road in the

first 53.16 miles of his trip.