SOLUTION: It takes Andy 45 minutes to clean the kitchen. His sister Anita can do the job in 30 minutes. How long would it take Andy and Anita to clean the kitchen if they worked together?
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Question 1129851: It takes Andy 45 minutes to clean the kitchen. His sister Anita can do the job in 30 minutes. How long would it take Andy and Anita to clean the kitchen if they worked together? Found 2 solutions by josgarithmetic, ikleyn:Answer by josgarithmetic(39617) (Show Source):
Every minute, Andy does of the job, working alone.
Every minute, Anita does of the job, working alone.
Working together, they do + = = = of the job every minute.
Hence, they will complete their job in 18 minutes, working together.
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