SOLUTION: it takes John three times as long to clean an office building as Lisa. If they work together, it takes 6 hours to clean. How long does it take Lisa by herself?

Question 845064: it takes John three times as long to clean an office building as Lisa. If they work together, it takes 6 hours to clean. How long does it take Lisa by herself?

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

John three times as long to clean an office building as Lisa's time

     |Multiplying thru by 6x so as all denominators = 1

   2 + 6 = x

    8 = x, time it takes Lisa alone. 

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