4 * 4 - 7 = 9
Start both sandglasses at the same time. When the 4-minute sandglass is
over, flip it to restart timing. Repeat this 3 times.
From the moment when the 7-minute sandglass is over, to the moment when
the 4-minute sandglass is over for the 4th time, is an interval of 9
minutes.
On 2011-3-22 15:35, Lavesh Rawat wrote:
***Hourglass**Problem Solution*
*
*Having 2 sandglasses: one 7-minute and the second one 4-minute, how
can you correctly time 9 minutes?
Update Your Answers at : Click Here
<http://dailybrainteaser.blogspot.com/2011/03/22march.html?lavesh=lavesh>
Solution:
Will be updated after 1 day
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