A can do a work in 12 days. B can do the same work in 24 days. If both A & B are working together in how many days they will finish the work? Choose the most appropriate option
A) 3  B) 5  C) 8  D) 2  E) 6
A rate = 1/12   B rate = 1/24   (A+B) rate = (1/12)+(1/24) = 1/8   A &amp; B finish the work in 8 days   correct option is 8
<result>C</result>
A can do a work in 12 days. B can do the same work in 24 days. If both A & B are working together in how many days they will finish the work?