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funny calculations

Discussion in 'Online Games & Puzzles' started by akalyaraju, Aug 22, 2007.

  1. akalyaraju

    akalyaraju New IL'ite

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    Hi


    There are 4 people named a,b,c,d.They are on a bank of a river. They need to cross the river using a bridge. It is very dark and they will have to cross with a help of a torch. nOW THE CONDITIONS

    The torch will last for only 17 minutes.
    a will cross in 1 minute
    b will cross in 2 minute
    c will cross in 8minutes
    d will cross in 10 minutes

    Only 2 people should go together.
    one person should come back to the starting position.

    The ? is what is the combination of persons
     
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  2. suja6

    suja6 New IL'ite

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    i think a and c will go together, as one person should return to starting point, a will take 16 min
     
  3. akalyaraju

    akalyaraju New IL'ite

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    hi suja


    ALL PERSONS SHOULD CROSS THE BRIDGE.WE WILL HAVE TO FIND OUT ALL THE COMBINATIONS
    yOURS
    AKALYA
     
  4. diana

    diana Bronze IL'ite

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    Hi akalyaraju,
    The answer is:
    First 'a' & 'b' will go together with the torch
    1 & 2 = 2 min (max time)

    then 'b' will return back with torch
    2 + 2 (earlier 2 min used) = 4 min

    then 'c' & 'd' will go torch
    8 & 10 = 10 min (max time)
    10 + 4 (earlier 4 min used) = 14 min

    now 'a' will return with torch
    1 + 14 (earlier 14 min used) = 15 min

    now 'b' will go back with torch (leaving 'a' behind)
    2 + 15(earlier 15 min used) = 17 min (Answer)

    so 'b', 'c' & 'd' will be on the other side
    and 'a' this side

    Am I right?

    Diana
     
  5. akalyaraju

    akalyaraju New IL'ite

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    Hi Diana

    You are absolutely right. Only the last combination is AB. because the condition is everyone shd cross in the end. How long did you take to do this? i couldn't do this. ONLY my husband solved this. Bye

    Yours
    Akalya
     
  6. diana

    diana Bronze IL'ite

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    Hi,

    How can last be AB. You said only one should be in the starting position. A & B start the game and end the game, leaving only A at the starting place.

    I did this in 15 min. as i knew one similar to this.

    let me put down:

    There are 4 people on one side of the river.

    A - father weighing 50Kg
    B - mother weight 50 kg
    C - son weighing 25 kg
    D - daughther weighing 25 kg

    then can cross the river using a boat. But the boat can carry weight only 50 kg maximum. They have to use the boat themselves (no other person to row). Now tell me how will all reach the other end.

    All the best :2thumbsup:

    Diana
     
  7. Saraswathipv

    Saraswathipv IL Hall of Fame

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    Hi Diana...

    C & D first cross and D remains there

    C returns in the boat

    A crosses and D comes back with the boat

    C and D again go and d remains there

    C returns again.

    B crosses the boat and D returns

    C and d then again go together

    :yes:




     
  8. diana

    diana Bronze IL'ite

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    Absolutely right:-D

    Diana
     
  9. Saraswathipv

    Saraswathipv IL Hall of Fame

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    Hi diana,

    where r u in salmiya. # yrs baack I was in Kuwait for a year. I stayed in the Caesar's takeway building , near ICSK.


     
  10. diana

    diana Bronze IL'ite

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    Hi saraswathi,

    I stay near the Indian community school salmiya.

    Diana
     

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