SOLUTION: If it takes 3 people 4 hours to paint a room. How long will it take 2 people to paint the same room?

Question 721140: If it takes 3 people 4 hours to paint a room. How long will it take 2 people to paint the same room?
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
Assuming each person works at an equal rate, the rates are additive when they work together. Let r be the rate at which any one worker works. , or is that one job in the 4 hour time period.

The Rate of ONE worker.

How long for TWO workers together to do the job?
Together , their combined rate is jobs per hour, ... OR...
6 hours to paint the room (one job).
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