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You have an 11-minute hourglass and a 7-minute hourglass. You need to measure exactly 15 minutes. How do you do it?

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Puzzle Admin 3 years 1 Answer 659 views 0

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  1. Maswood Khan

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    place both hourglass together, wait till 7 minute hourglass emptied (till now we have measured 7-minute and 4 minute remaining in 11-minute hourglass). Now reverse 7-minute glass and start it again, as soon as 11-minute glass emptied reverse 7-minute glass again. Wait till 7-minute becomes empty, Now it’s been 15 minute.

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