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A carpenter is working on a deck.  He hires two assistants who work 60% as fast as he works.  If all three work together on the deck, they should finish in what fraction of the time that he would take working alone?

 Mar 9, 2022
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Carpenter rate = 1 job / 1

assistant rates =   1 job / (6/10)

 

All three    1 job / ( 1 + 6/10 + 6/10)  = 1 / 2.2 = 5/11

 Mar 9, 2022

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