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If you have an 11 minute and 13 minute hourglass, how can you accurately time 15 minutes?

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posted Jun 16, 2014 by Vikram Luthra

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Start with both the hourglasses. When 11 minute's finishes, stop both of them. then turn the 11 minute's hourglass. and start the 13 minute's hourglass. this will give us the 2 minutes in 11 minute's time in that hourglass. and using this we can measure 15 MINUTES.

solution Aug 8, 2014 by Ankit Bajpai
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