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#1
01-13-2018, 01:54 AM
 hari109 Junior Member Join Date: Jan 2018 Location: India Posts: 14
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?

More at https://spirit-of-genius.blogspot.in...professor.html
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#2
01-13-2018, 09:59 PM
 hari109 Junior Member Join Date: Jan 2018 Location: India Posts: 14
15 Minutes Countdown

This is how he can set countdown for 15 minutes!

https://spirit-of-genius.blogspot.in...countdown.html
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#3
01-31-2018, 11:06 AM
 swatso Junior Member Join Date: Oct 2013 Posts: 3

Quote:
 Originally Posted by hari109 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? More at https://spirit-of-genius.blogspot.in...professor.html
T=0: A=7 B=11
Flip both.
T=7: A=0 B=4
Flip A.
T=11: A=3 B=0
Flip A.
T=15: A=0

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