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Mack and Sean can complete a jbo in 2 hours working together.  If Mack requires 3 hours to do the job alone, how many hours does Sean need to do the job alone?

 Jun 9, 2020
 #1
avatar+26620 
+1

1/3  + 1/S = 1/2    Solve for 'S'     Sean's time to do the job alone

 Jun 9, 2020

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