Questions on Word Problems: Evaluation, Substitution answered by real tutors!

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Question 151722: Sally paints a house in 4 hours, John can paint the same house in 6 hours, how long will it take for Sally and John to paint the house together?: Sally paints a house in 4 hours, John can paint the same house in 6 hours, how long will it take for Sally and John to paint the house together?
Answer by checkley77(3654) About Me  (Show Source):
You can put this solution on YOUR website!
4*6/(4+6)=24/10=2.4 hours when they work together.