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#1 puzzled

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Posted 11 February 2008 - 10:53 AM

Your grandfather is staying at your house. One day he gets sick and tells you "I need an egg, newly cooked for exactly 15 minutes in 15 minutes or I will faint". A problem you encounter is that the only timing devices you have are a 7 minute hourglass and an 11 minute hourglass. How will you do it?
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#2 bonanova

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Posted 11 February 2008 - 11:13 AM

Spoiler for This should work

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The greatest challenge to any thinker is stating the problem in a way that will allow a solution.
- Bertrand Russell

#3 rookie1ja

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Posted 11 February 2008 - 11:28 AM

good one, however, it's already posted - check Sand-glass II.

there is more of this type in the section called Water and Weighing Puzzles

looking forward to new puzzles ... this thread is locked
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