Measure by Hourglass

It's a test that will check your IQ.

Suppose you have one 11 minute hourglass and one 13 minute hourglass.

Can you measure exactly fifteen minutes using them ?




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A man desired to get into his work building, however he had forgotten his code.
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What is the code ?

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What does this mean?

CCCCCCC

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The peacock is a bird that does not lay eggs. How do they get baby peacocks?

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There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.