An eccentric professor used a unique way to measure time for a test lasting 15 minutes.
He used just two hourglasses. One measured 7 minutes and the other 11 minutes.
During the whole time he turned the hourglasses only 3 times.
How did he measure the 15 minutes?
Click here for answer...
He used just two hourglasses. One measured 7 minutes and the other 11 minutes.
During the whole time he turned the hourglasses only 3 times.
How did he measure the 15 minutes?
Click here for answer...
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