Puzzler of the week

[Scott MacLean]

This week's puzzler:

In his youth a man decides to take a trip to visit the great pyramids of Egypt.  He is deeply moved by the trip, and years later he decides to take his son who has never been away from home to see the pyramids.

Here�s the catch.  The man made his trip to the pyramids in 1995, but his son made his trip to see them in 1969.

How is this possible? 

Last week's puzzler:

This is the season for Cub Scouts all over the country to hold their Pinewood Derby Races.

My two sons built their cars and wanted to compete against each other at home prior to the real race.  I built a simple racetrack using materials I had on hand.  However, I only had materials to build a one-lane track.

I had planned to run the cars individually and use a stop watch to time each car.  So, son A would put his car at the top and let it go.  I'd start the watch, and when it got across the finish line, I'd check the time. But when we attempted to hold races I discovered that the cars traversed my very short track in such a short time that I could not start and stop the watch fast enough to accurately measure the times such that we could really determine which car was faster.

My younger son, who was eight years old, came up with a solution. Remember, all we had were the two cars, the short test track, the stop watch and the three of us.

What solution did he come up with?

Last week's puzzler answer:

He very simply said, "Let's put both cars on the track, one behind the other."

If the front car, that is the car closest to the finish line is faster when we release the two cars simultaneously, of course, that one will pull away from the other one, and it will be the faster car. Otherwise the other one will push it over there, over the fast one.

Well, once you've done that first heat you're going to reverse the position of the cars, and see if in fact that no gap opens and then the rear car, which had been the front car, will be the faster car

_______________________
Scott MacLean
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