Personal Comment: Think about this one for a while.
Catching Up Enigma!
What we know: A truck travels 15 mph for the first half of the distance of a trip. The driver wants to average 30 mph for the whole trip.
Enigma: How fast must he travel for the second half of the trip?
Solution: Infinity. Assume any distance for the trip. If you said 30 miles, then the first half took 1 hour. But to average 30 mph for the total trip would require an hour. Therefore the puzzle has no solution and it is impossible!
