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Hourglass puzzle

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Hourglass puzzle

Post by Guest on Thu Dec 29, 2011 1:56 pm

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 Thu Dec 29, 2011 4:28 pm

Smartarse! well done.

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Re: Hourglass puzzle

Post by Guest on Sat Dec 31, 2011 2:30 pm

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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