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One custodian cleans a suite of offices in 3 hours. When a second worker is asked to join the regular custodian, the job takes only 2 hours. How long does it take the second worker to do the same job alone?

 Mar 10, 2020
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1/3  +  1/s  = 1/2      s = time for second alone, solve for s

 

1/s = 1/2 - 1/3

1/s = 1/6

s= 6 hours

 Mar 10, 2020

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