SOLUTION: A man can paint a room by himself in 8 hours and it takes his son 12 hours to do the same job. The man works by himself for three hours, then his son joins him and the two together

Question 204667: A man can paint a room by himself in 8 hours and it takes his son 12 hours to do the same job. The man works by himself for three hours, then his son joins him and the two together complete the job. How long does the son work?
Answer by Earlsdon(6294) (Show Source): You can put this solution on YOUR website!
If the man can paint the room in 8 hours, then he can paint of the room in 1 hour.
If his son can paint the room in 12 hours, then he can paint of the room in 1 hour.
Now if the man works by himself for 3 hours, then he can paint:
of the room which leaves of the room to paint.
Now the man and his son, working together can paint of the room in 1 hour.
So the question is, how long would it take the father & son together to finish the of the room?
To find this, we'll divide the by .
= .
The son works for 3 hours.
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