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You have two hour glass: 11 minutes and 7 minutes.

Problem, time an egg cooking for fifteen minutes.


Step 1. Put water on to boil, as you want the water boiling when you cook an egg.
Step 2. Start both the 11 and the 7 minute timers
Step 3. When the seven minute timer runs out, you still have four minutes left on the eleven minute timer (11-7=4). Put the Egg in the water now and wait four minutes.
Step 4. When the eleven minute timer runs out (the egg has been in the water for four minutes), turn it over and wait till it runs out again.
Step 5. When the eleven minute timer runs out the second time the egg is done.

4 minutes + 11 minutes = 15 minutes.

Step 6. Run the egg under cold water for a minute to cool the shell
Step 7. Peel egg and cut into quarters, lightly salt to taste.
Step 8. Enjoy eating your hard boiled egg.

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Q: How can a chef use an 11-minute hourglass and a 7-minute hourglass to time vegetables that must steam for 15 minutes?
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