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Boiled Egg in 15 minutes

I had come across this puzzle somewhere, I don't remember where. 😳

The puzzle is:
You have a 7 minutes and a 11 minutes hourglass. You have to boil an egg in 15 minutes. With the help of these 2 hourglasses how will you time 15 minutes?

Replies

  • avii
    avii
    Hmm...

    Starting the both hourglasses. When 7 min one finishes I'd have 4 mins left in 11 min one. Put the egg in boiler, start the 11 min one, it has 4 mins left. Then turn it over, gives 11 mins again. So it makes 4+11 = 15 😀

    BTW I would need 5 more mins to add pepper, salt & gulp it 😁
  • Dancer_Engineer
    Dancer_Engineer
    That's right.

    There is another solution too:
    Put the egg for boiling. Start both the hourglasses. After 7 minutes hourglass is completed, turn it over till the 11 minutes hourglass is completed. So the 7 minutes hourglass has now completed 4minutes, turn it over again. So it becomes: 7 + 4 + 4 = 15minutes.

    PS: Extra 5 minutes granted for you. 😛
  • avii
    avii
    I think mine needs less work xD

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prasad

Hi i am a student studying mca in viziag I am very much interest about computers