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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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Please briefly explain why you feel this answer should be reported .
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.