SOLUTION: It takes Sally 15 minutes to pick apples from the tree in the backyard. Lisa can do it in 25 minutes. How long will it take them working together?

Question 414253: It takes Sally 15 minutes to pick apples from the tree in the backyard. Lisa can do it in 25 minutes. How long will it take them working together?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
sally 15 minutes
Lisa 25 minutes
..
Sally does 1/5 of job in 1 minute
Lisa does 1/25 of the job in 1 minute
..
Together they do 1/15 +1/25 of the job in 1 minute
LCD = 75
(5+3)75 of the job in 1 minute
8/75 of the job in 1 minute
so together they take 75 /8 minutes
9 3/8 minutes

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