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?

Algebra ->  Rate-of-work-word-problems -> 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?      Log On


   

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) About Me  (Show Source):
You can put this solution on YOUR website!


Hi

+1%2F8+%2B+1%2Fx+=+1%2F5   |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