Some puzzles from Shakuntala Devi's puzzle book

Discussion in 'Online Games & Puzzles' started by CHABOLU, Feb 7, 2013.

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  1. Feb 7, 2013 #1
    CHABOLU

    CHABOLU Platinum IL'ite

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    I chanced upon Shakuntala Devi's puzzle book while cleaning the book rack. The book was bought in 1987 for my children. I thought why not give the viewers some puzzles to solve. Here is my first puzzle

    Two identical trains at the equator start travelling round the world in opposite directions. They start together, run at the same speed and are in different tracks.
    Which train will wear out its wheel treads first?
     
    CHABOLU, Feb 7, 2013
    CHABOLU, Feb 7, 2013
    #1
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  2. Feb 7, 2013 #2
    Dinny

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    I say the train travelling against the spin of the earth. This train will wear out its wheels more quickly, because the centrifugal force is less on this train :)

    so whats the next question??bring it on!!
     
    Dinny, Feb 7, 2013
    Dinny, Feb 7, 2013
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  3. Feb 7, 2013 #3
    sudhajay

    sudhajay Silver IL'ite

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    Next door to me live four brothers of different heights. Their average height is 74 inches, and the difference in height amongst the first three men is two inches. The difference between the third and the fourth man is six inches. Can you tell how tall is each brother?
     
    sudhajay, Feb 7, 2013
    sudhajay, Feb 7, 2013
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  4. Feb 7, 2013 #4
    CHABOLU

    CHABOLU Platinum IL'ite

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    You get 100 out of 100
     
    CHABOLU, Feb 7, 2013
    CHABOLU, Feb 7, 2013
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  5. Feb 8, 2013 #5
    Dinny

    Dinny IL Hall of Fame

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    Answers. 1st brother-70'tall,2 nd brother -72'tall, 3rd brother-74'tall ,4th brother -80' tall
    Hows that???
     
    Dinny, Feb 8, 2013
    Dinny, Feb 8, 2013
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  6. Feb 8, 2013 #6
    sudhajay

    sudhajay Silver IL'ite

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    Sooper Dinny.. Congrats..

    then who is going to post next puzzle..???
     
    sudhajay, Feb 8, 2013
    sudhajay, Feb 8, 2013
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  7. Feb 8, 2013 #7
    CHABOLU

    CHABOLU Platinum IL'ite

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    next puzzle
    A man owns a horse, a cow and a sheep. He also owns a pasture to graze them all.
    If the horse and cow can eat the contents of the pasture in 40 days. while the horse and sheep can do it in 60 days and the cow and the sheep in 90 days, how long should it take all of them eating together?
     
    CHABOLU, Feb 8, 2013
    CHABOLU, Feb 8, 2013
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  8. Feb 8, 2013 #8
    Dinny

    Dinny IL Hall of Fame

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    Did u mean cow and the sheep in 90 days bcoz the equation if going wrong
     
    Dinny, Feb 8, 2013
    Dinny, Feb 8, 2013
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  9. Feb 8, 2013 #9
    CHABOLU

    CHABOLU Platinum IL'ite

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    Sorry typing mistake. I corrected it now
     
    CHABOLU, Feb 8, 2013
    CHABOLU, Feb 8, 2013
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  10. Feb 8, 2013 #10
    Dinny

    Dinny IL Hall of Fame

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    .:ideathe answer is 720/19 or 37.89 days to be exact

    Ok now allow meBow

    there is one brother and sister.when the sister is 3yrs old then the brother is double her age.so what will be the age of brother when sister is 9 years old.
     
    Dinny, Feb 8, 2013
    Dinny, Feb 8, 2013
    #10
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