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An Experimental Professor

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 few times. 

Measure 15 minutes usnig 7 & 11 minutes hourglasses

How did he measure the 15 minutes?

Couple of methods to count 15 minutes. 

This post first appeared on Spirit Of Genius, please read the originial post: here

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An Experimental Professor


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