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Hourglass puzzle

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Hourglass puzzle

Post by Guest on Fri Dec 30, 2011 12:56 am

Given a 4 minute hourglass and a 7 minute hourglass (you know - one of those fings wif sand in it), how do you time exactly 9 minutes? (And the process must take no longer than 9 minutes.)

89

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Re: Hourglass puzzle

Post by Guest on Fri Dec 30, 2011 3:28 am

Smartarse! well done.

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Re: Hourglass puzzle

Post by Guest on Sun Jan 01, 2012 1:30 am

Or run the 7 minute hourglass, then the 4 minute one HALFWAY through?! LOL D

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Re: Hourglass puzzle

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