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Puzzle ZNBA 



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If one small rabbit can dig a warren in nine hours, a medium rabbit can dig a warren in 6 hours, and a large rabbit can dig a warren in four and a half hours.

How long will it take one small, one medium and one large rabbit to dig a warren if they all work together?

Puzzle Copyright © Kevin Stone

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Hint
How much of a warren each rabbit dig in one hour?

 

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