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Jack and Serena can write a lab report together in $2$ hours.  If all people work at the same rate, how many hours would it take to write a lab report if Kay joins Jack and Serena?

 Sep 30, 2021
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It takes each of them 4 hours alone

 

1/ (1/4 + 1/4 + 1/4) =  4/3 hr if they all work on it

 Sep 30, 2021

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