SOLUTION: Myra can weed a garden in 3hrs. Ana can do it in 4hrs. How long will it take them to weed the garden if they work together?

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Question 625349: Myra can weed a garden in 3hrs. Ana can do it in 4hrs. How long will it take them to weed the garden if they work together?
Found 2 solutions by oscargut, Emsley:
Answer by oscargut(2103) About Me  (Show Source):
You can put this solution on YOUR website!
Solution: 1/(1/3+1/4) = 1/(7/12) = 12/7 = 1 and 5/7 hs
Answer: 1 and 5/7 hs


If you have any doubt or if you have more problems my e-mail is:
mthman@gmail.com

Answer by Emsley(35) About Me  (Show Source):
You can put this solution on YOUR website!
M can weed 1/3 of garden in 1 hour. A can weed 1/4 of it in 1 hour
So together they can weed 1/3+1/4 =7/12 in 1 hour
So it takes them 12/7 hours together. That is close to 1hr 43min