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

Question 352889: It takes sally 15 minutes to pick apples from the tree in her backyard. Lisa can do it in 25 minutes. How long will it take them together?
Found 2 solutions by scott8148, amalm06:
Answer by scott8148(6628) (Show Source): You can put this solution on YOUR website!
(x / 15) + (x / 25) = 1
Answer by amalm06(224) (Show Source): You can put this solution on YOUR website!
Work rate, Sarah: dWs/dt=1/15 --> dWs=(1/15)dt

Work rate, Lisa: dWL/dt=1/25 --> dWL=(1/25)dt

W==1

[(1/15)+(1/25)]t=1

t=9.375 hrs (Answer)
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