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this was a Q asked during an interview to a relative. i want a answer?

okay

there is a bridge and 4 ppl r waiting on 1 side of the bridge.

they have a candle only one candle wht them

they need 2 cross the bridge.

they can do so only wth the help of a candle.

only 2 ppl can cross the bridge at a time.

person 1 can cross the bridge i 1 sec. person 2 in 2 sec. person 3 in 8 seconds n person 4 in 10 seconds.

calculate the minimum time required by the 4 to cross the bridge.

HINT:

if person 10 n 1 go together minimum time required will be 10 seconds.n person 1 has to *** back wth the candle so that others can cross the bridge.

Update:

1 person has to act as a commuter

i.e. he has to go back

10 Answers

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  • Anonymous
    1 decade ago
    Favorite Answer

    1. Person 1 and Person 2 cross... 2 secs

    2. Person 1 returns.........................1 sec.

    3. Person 10 and 8 cross.............10 sec.

    4. Person 2 returns..........................2 sec.

    5. Person 2 and 1 cross..................2 sec.

    ------------------------------------------------------------

    Total time taken...............................17 Sec!!!.

  • NY33
    Lv 5
    1 decade ago

    22 seconds

    1+2 cross - 2 seconds

    1 returns - 1 second

    1+3 cross - 8 seconds

    1 returns - 1 second

    1+4 cross - 10 seconds

    2+1+8+1+10=22

  • 1 decade ago

    22seconds

    1 n 2 take 2 secs

    1 n 3 take 8 secs

    1 n 4 take 10 secs

    plus he wud need 2 sec to return in 1 situation n second situation

  • ?
    Lv 4
    5 years ago

    Dress are smart as possible, better too look too smart than to casual. no jeans or trainers in an interview id say! They'll ask you about customer service(when youve given it, what your idea is, what it means to you), they might ask you when you've worked in a team. There are sites online that give you many questions They are only guidelines really they probably will ask about customer serivce and teamwork but who knows how they ask it just prepare some answers, think of your strengths and weakness i had an interview and have the job now. they asked me what i thought the job duities were, example of when i worked under pressue. hope that helps

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  • 1 decade ago

    1 & 2 cross = 2 secs

    thn 1 returns= 1 sec

    8 &10 cross = 10 sec

    thn 2 returns= 2 sec

    2 & 1 cross = 2 sec

    total 17 secs

    plzzzz don forget to giv me d best answer

  • Anonymous
    1 decade ago

    the 1st one and the second one will go first .the 1st person will again come back with the candle . then the 3rd person will go with the 4th one. once they have crossed the 2nd one will come back again and this time they will go together

  • Anonymous
    1 decade ago

    28 seconds?

  • Anonymous
    1 decade ago

    Good question????

    I did do his several years back in a picture format,now not able to remember,so I let others answer them and then read the answer in the end.Thanks!!!!!!!!!!!!!!

  • Anonymous
    1 decade ago

    http://www.plastelina.net/game3.html

    click on the 'family crisis' tag

  • 1 decade ago

    This is a very difficult question to even comprehend, I can't make head nor tails of it, use proper English, please...!

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