Hourglasses puzzle

By | April 27, 2014

This is puzzle asked to candidates in google interviews.The idea is somewhat similar to the burning candle puzzle.
Here’s the Puzzle :

Puzzle :You have two hourglasses. One measured 7 minutes and the other 11 minutes.
How will you measure the 15 minutes using only these two hourglasses? Now here’s the twist you are only allowed to turn the hourglasses a total two times mean you can turn any of the glass two times or both the hourglasses one time each.

The problem is not that complex as it sounds.Try to think at least how to measure 15 minutes without following respecting the last constraint.


For more interesting puzzles see our puzzles page

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