SOLUTION: A painter can paint a certain house in 12 hours by herself but it takes her helper 15 hours to do the same job himself. the painter starts the job alone but her helper her 5 hours

Question 666104: A painter can paint a certain house in 12 hours by herself but it takes her helper 15 hours to do the same job himself. the painter starts the job alone but her helper her 5 hours later. How long will it take the two of them together to finish painting the house?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!

 

Hi,

A painter can paint a certain house in 12 hours by herself: 

In 5hrs  done.   of the house remaining to complete

helper 15 hours to do the same job himself:

   = 9/60  of the house per hour together

 = 35/9 hr   remaining time together 

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