This Puzzle is one of the most commonly asked interview Puzzles and most of the time students are not able to answer it correctly.
You have two sand timers with you. One can measure 7 minutes and the other sand timer can measure 11 minutes. This means that it takes 7 minutes for the sand timer to completely empty the sand from one portion to the other.
You have to measure 15 minutes using both the timers. How will you measure it.
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