SOLUTION: Andrew and paint a room in 6 hours. Marianne can do the sme job in 4 hours. Working together, how long will it take to complete the job

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Question 708822: Andrew and paint a room in 6 hours. Marianne can do the sme job in 4 hours. Working together, how long will it take to complete the job
Answer by josgarithmetic(39626) About Me  (Show Source):
You can put this solution on YOUR website!
Rates are additive. Rate*Time=Jobs. The number of jobs Andrew and Marianne will do together is 1. Andrew's rate is 1 job per 6 hours. Marianne's rate is 1 job per 4 hours. As said, when working together, their rates are additive.