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?
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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
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sum of individual work rates=work rate working together
{{{1/x+1/4=1/3}}}
{{{1/x=-1/4+1/3}}}
{{{1/x=1/12}}}
x=12
hours Kiara can finish the job alone=12