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Topic: This Week's Finds in Mathematical Physics (Week 140)
Replies: 10   Last Post: Oct 27, 1999 9:53 PM

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Christopher Hillman

Posts: 388
Registered: 12/12/04
Re: This Week's Finds in Mathematical Physics (Week 140)
Posted: Oct 23, 1999 12:02 AM
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On 22 Oct 1999, Phillip Helbig 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?

I've heard that one too, but with the additional detail that this was the
story as told by Martin Gardner in one of his columns. I heard that the
real problem was a lot harder, but that MG told a simplified version in
the context of explaining the fly problem.

The problem you mention certainly strikes me as much too simple to have
the ring of truth, since anyone could sum -that- series in their head in a
few seconds!

Chris Hillman

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