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How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

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posted Apr 3, 2015 by Nikita Sehgal

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1 Solution

+4 votes

Start both hourglass at same time
As 7minutes gets competed,by 11 minutes
We remains with 4 minutes
Now as soon as 11 minutes hourglass completes ,reverse it
We get 11 minutes
Finally We get 15 minutes,4 minutes and this 11 minutes

solution Apr 3, 2015 by Jaspalsingh Parmar
So, after 7 min, indeed there is 4 min left in the other hourglass. Do you mean, that this will be the starting point of the measure of 15 min?
Ya ryt.....that will be the starting point

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