Hourglass Puzzle Only for Geniuses

This hourglass math and the logic puzzle is only for genius brains. I suggest you solve our earlier hourglass puzzle before solving this genius hourglass puzzle. In this hourglass puzzle, your challenge is to measure 24 minutes with two hourglasses which measure 7 minutes and 11 minutes. Let us see if you can solve this math puzzle!

Can you solve this hourglass puzzle?

The answer to this "Math Puzzle Only for Geniuses", can be viewed by clicking on the answer button.

The Answer is as explained below
Start both 7 minutes (A) and 11 minutes (B) hourglass together. When A is over, turn it upside down. When B is over, 3 minutes are remaining in A. Not the time from now onwards. Once A is over, turn it upside down 3 times in sequence to read 3+7+7+7 = 24 minutes.
Our solution may not be optimized. in case you are able to find a better solution, please post your detailed answer in comments.

Check Out Mathematics Logic Brain Cracking Problems with Answers and Explanations