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Eggalicious (Posted on 2002-07-05) Difficulty: 2 of 5
You have to boil a single egg for exactly nine minutes.

All you have are two hourglasses, able to measure (in sand) seven and four minutes, respectively.

How quickly, using only these two hourglasses, can you boil an egg?

See The Solution Submitted by qball    
Rating: 2.7857 (14 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(2): Solution: | Comment 12 of 20 |
(In reply to re: Solution: by G. Steve Arnold)

The 16 minute solution is viable, but not the shortest, and is therefore wrong. It would be the sortest solution if you were dealing with egg timers, or some other way of measuring time. However, because we have two hourglasses, we can achieve the desired result in a shorter time. See TomM's earlier post for the correct answer.
  Posted by levik on 2002-07-09 08:06:00

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