Book shifting puzzle


Jacob and John were busily emptying their book shelves from one room to another.

Jacob on his own could have cleared the room in 18 hours.

John also would take 18 hours.

Unfortunately, James was moving the books back into the first room from the second.

He could fill the first room in 36 hours.

How long will it take the three of them to complete the task?

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  • 2 Answer(s)

    12 hrs==>
    1/18 +1/18 -1/36 ==>1/12==> it takes 12 hrs.

    Rajesh0369 Scholar Answered on 2nd August 2018.
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    11 Hours and 15 minutes

    Seeker008 Expert Answered on 20th August 2018.
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