SOLUTION: a father and a son working together can finish painting a room in 6 hours. working alone, the father takes 9 hours to do the painting. how many painting hours will it take the son,
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Question 885705: a father and a son working together can finish painting a room in 6 hours. working alone, the father takes 9 hours to do the painting. how many painting hours will it take the son, working alone to finish the painting room?
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Add their rates of painting to get their
rate painting together
Let = time in hours for son to paint
the room working alone
----------------------------
( 1 room ) / ( 9 hrs ) + ( 1 room ) / ( t hrs ) = ( 1 room ) / ( 6 hrs )
Multiply both sides by
It takes the son 18 hours working alone to paint the room
------------------
check:
OK
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