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Friday, January 20, 2006

Jon's MENSA Question of the Day

--posted by JRJ on 1/20/2006

You have decided to take your morning run in preparation for the local marathon at an average speed of 6 miles per hour. Unfortunately, you are not in as good shape as you thought, and you are running uphill. You find that you complete a half of the run, all uphill, at an average speed of only 3 miles per hour. How fast must you run to make the return trip - all downhill - at an average speed for the entire round trip of 6 miles per hour?



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