SOLUTION: Margaret and Kiara can finish a certain work in 3 hours. If Margaret works alone, she can finish it in 4 hours. How many hours would it take Kiara to do the work alone?

Question 772965: Margaret and Kiara can finish a certain work in 3 hours. If Margaret works alone, she can finish it in 4 hours. How many hours would it take Kiara to do the work alone?
Answer by lwsshak3(11628) (Show Source): You can put this solution on YOUR website!
Margaret and Kiara can finish a certain work in 3 hours. If Margaret works alone, she can finish it in 4 hours. How many hours would it take Kiara to do the work alone?
..
Margaret and Kiara can finish a certain work in 3 hours.
Their work rate=1/3
Margaret works alone, she can finish it in 4 hours.
Her work rate=1/4
let x=hours Kiara can finish the job alone
Her work rate=1/x
..
sum of individual work rates=work rate working together

x=12
hours Kiara can finish the job alone=12
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