SOLUTION: Cindy and Mary owns a landscaping company. Cindy can complete a certain garden planting in 3 hours, while mary takes 4 hours to complete the same job. If both of them work together

Question 922365: Cindy and Mary owns a landscaping company. Cindy can complete a certain garden planting in 3 hours, while mary takes 4 hours to complete the same job. If both of them work together, how long will it take to plant the garden?
Found 2 solutions by ewatrrr, stanbon:
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
x the time together

4x + 3x = 12
7x = 12
x = 12/7 0r 1 5/7 hr
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Cindy and Mary owns a landscaping company. Cindy can complete a certain garden planting in 3 hours, while mary takes 4 hours to complete the same job. If both of them work together, how long will it take to plant the garden?
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Cindy rate:: 1/3 job/hr
Mary rate:: 1/4 job/hr
---
Together rate:: 1/x job/hr
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Equation:
rate + rate = together rate
1/3 + 1/4 = 1/x
---
4x + 3x = 12
---
7x = 12
x = 12/7 hrs (time to do the job together)
Cheers,
Stan H.
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