SOLUTION: Joan can weed the garden in 40 min and her mother can weed it in 60 min. How long would it take them working together?

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Question 485480: Joan can weed the garden in 40 min and her mother can weed it in 60 min. How long would it take them working together?
Answer by deborabr(181) About Me  (Show Source):
You can put this solution on YOUR website!
mmc(40,60)
40,60|2
20,30|2
10,15|2
5,15|3
5, 5|5
1, 1
mmc(40,60)=2*2*2*3*5
mmc(40,60)=120
they will work together after 120min or 2 hours