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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.

   
rec.puzzles
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alt.brain.teasers
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FAQ
Categories : analysis : bicycle.p

A boy, a girl and a dog go for a 10 mile walk.  The boy and girl can
walk at 2 mph and the dog can trot at 4 mph.  They also have a bicycle
which only one of them (including the dog!) can use at a time.  When
riding, the boy and girl can travel at 12 mph while the dog can pedal
at 16 mph.  What is the shortest time in which all three can complete
the trip?


Solution


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