Alex and Blake were busily emptying their book shelves from one room to another.
Alex on their own could have cleared the room in 18 hours.
Blake also would take 18 hours.
Unfortunately, Drew was moving the books back into the first room from the second.
They could fill the first room in 36 hours.
How long will it take the three of them to complete the task?
[Puzzle Code = ZTUW] Copyright © Kevin Stone
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