SOLUTION: sally can paint house in 4 hrs and john in 6 hrs, how long together?

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Question 158156: sally can paint house in 4 hrs and john in 6 hrs, how long together?
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
In 1 hour sally can paint 1/4 and john 1/6 of the house.
1/4 + 1/6
= 3/12 + 2/12
=5/12 of the house in 1 hour together
So, 12/5 hours to paint the entire house together.
.
Ed