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.
How did he measure the 15 minutes?
Couple of methods to count 15 minutes.
Source
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.
How did he measure the 15 minutes?
Couple of methods to count 15 minutes.
Source
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