Use your skills to solve this riddle.
You are given one 11 minute hourglass and one 13 minute hourglass.
Can you measure exactly fifteen minutes with the help of them?
So were you able to solve the riddle? Leave your answers in the comment section below.
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Start both hourglasses then when the 11 minute hourglass has finished immediately flip it again.
When the 13 minute hourglass runs out the 11 minute hourglass will have 9 minutes left, so flip it and it will last another 2 minutes, 13 minutes + 2 minutes = 15 minutes.