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Usenet Newsgroups : rec.puzzles Hall of Fame

The rec.puzzles Hall of Fame is a compilation of over 500 of the most popular puzzles that have been posted and discussed in the rec.puzzles newsgroup. In most cases a detailed solution has been provided.

Many of these puzzles also appear in Braingle's own collection.

Hall of Fame
Categories : geometry :

A duck is swimming about in a circular pond.  A ravenous fox (who
cannot swim) is roaming the edges of the pond, waiting for the duck to
come close.  The fox can run faster than the duck can swim.  In order
to escape, the duck must swim to the edge of the pond before flying
away.  Assume that the duck can't fly until it has reached the edge of
the pond.

How much faster must the fox run that the duck swims in order to be
always able to catch the duck?

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