SOLUTION: you can paint a room in 8 hours, together you and your friend can paint a room in 5 hours. How long does it take your friend to paint a room by himself?

Question 873638: you can paint a room in 8 hours, together you and your friend can paint a room in 5 hours. How long does it take your friend to paint a room by himself?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!



Hi

   |Multiplying thru by 40x so as all denominators = 1

  5x + 40 = 8x

       40/3 = x = 13 1/3 hr, time it take your friend to paint a room by himself 

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