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Amazon Eggs


You are the leader of an exploration in the deepest part of the Amazon jungle. Your party has been captured by a fierce tribe of primative head hunters.

Ever resourceful, you find out that the chief is very fond of eggs which have been cooked for exactly nine minutes. Though the tribe has confiscated your watches, you discover that your still have two hourglasses: one has a duration of 7 minutes, and the other, 4. And, as luck would have it, they already have a caldron of boiling water.

Cleverly, you strike a bargain with the chief to spare your life and release your party if you can provide him with eggs cooked exactly the way he likes them.

How do you do it?

Answer

Start both timers. When the 4-minute one is emptied, turn it over, letting the 7-minute timer continue to run for the remaining 3 minutes. When the 7 minute one is emptied, put the eggs in the boiling water. There will be one minute to go before the 4-minute timer is emptied. When it DOES empty, turn it over. Five minutes will have elapsed. When the 4 minute timer empties again, 9 minutes will have elapsed and the eggs will be just like the chief likes them.
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This page revised   August 3, 2004
 
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