In article <email@example.com>, firstname.lastname@example.org wrote:
> The problem being: Two trains are 60 miles apart and approaching each > other at 30 miles per hour. There is a fly flying between the > cowcatchers of each train, at 60 miles per hour, back and forth, turning > around immediately. What is the total distance covered by the fly > (relative to the ground, NOT taking the motion in opposite directions to > cancel) until the trains hit?
[Moderator's note: Further discussion of this puzzle doesn't belong on sci.physics.research, unless some additional physics content can be injected. I would suggest that the thread be redirected to rec.puzzles, but I think that bringing up an old chestnut like this there would elicit some flames. -TB]