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Puzzle : Set Timer without Clock?

Tags: cook clock
You are a Cook in a remote area with no clocks or other way of keeping time other than a four-minute and a seven-minute hourglass. On the stove is a pot of boiling water. Jill asks you to cook a nine-minute egg in exactly 9 minutes, and you know she is a perfectionist and can tell if you undercook or overcook the egg by even a few seconds. 

How can you cook the egg for exactly 9 minutes?


You should follow THIS process! 


This post first appeared on Spirit Of Genius, please read the originial post: here

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Puzzle : Set Timer without Clock?

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