SOLUTION: It requires 5 hrs for Margaret to paint a building. If she and Sam work together, they can paint the same building in 3 hours. Find the time, in hours, it would take Sam to paint t

Question 796733: It requires 5 hrs for Margaret to paint a building. If she and Sam work together, they can paint the same building in 3 hours. Find the time, in hours, it would take Sam to paint the building alone.
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = time in hrs for Sam to paint building alone
Margaret's rate: ( 1 building ) / ( 5 hrs )
Margaret and Sam together: ( 1 building ) / ( 3 hrs )
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Add their rates to get rate working together

Multiply both sides by

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Sam can paint the building alone in 7.5 hrs
check:

OK

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