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vdmohit loves solving puzzles at PuzzleFry.com. I am proud PuzzleFry member and like my time invested in solving brain teasers.
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Start both hourglasses. when 11 hourglass has finished, this is the time which is beginning of 15 minutes . when 13 hourglass has finished then flip it immediately again. when 13 hourglass has been finished again we get (13-11)+13 = 15 minutes.
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