The Mathematician in the Desert (Math Chat)
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http://www.maa.org/features/mathchat/mathchat_5_20_99.html  


Frank Morgan, MAA Online  
A mathematician, lost in the desert, hears a single toot from a train due west. He knows that the train goes at constant speed in a straight line, but he forgets in which direction. What direction should he walk?  


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