SOLUTION: sally can paint a room in 3 hours while it takes steve 9 hours to paint the same room. how long would it take them to paint the room if they worked together?

Question 475242: sally can paint a room in 3 hours while it takes steve 9 hours to paint the same room. how long would it take them to paint the room if they worked together?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
sally can paint a room in 3 hours while it takes steve 9 hours to paint the same room. how long would it take them to paint the room if they worked together?
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Sally rate = 1/3 job/hr
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Steve rate = 1/9 job/hr
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Together rate = 1/x
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Equation:
rate + rate + together rate
1/3 + 1/9 = 1/x
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3x + x = 9
4x = 9
x = 9/4 = 2 1/4 hrs. (time to do the job together)
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Cheers,
Stan H.
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