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Sandy rakes and bags the leaves on her front lawn in 30 minutes. Randy does the same job in 20 minutes. How many fewer minutes will it take to complete the same job if Sandy and Randy work together than if Sandy works alone?

 May 15, 2020
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Randy rate   1 job  20 minutes   = 1/20

Sandy = 1/30

 

1/30  + 1/20 = 1/x     x is the minutes for both of them to complete the job

                                       solve for 'x'    then you answer is   sandy time - x    = 30 - x

 May 15, 2020

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