A can do a work in 9 days. B can do the same work in 18 days. If both A & B are working together in how many days they will finish the work?
Choices.
A) 3
B) 5
C) 4
D) 2
E) 6
A rate = 1/9   B rate = 1/18   (A+B) rate = (1/9)+(1/18) = 1/6   A &amp; B finish the work in 6 days   correct option is 6
<result>E</result>
A can do a work in 9 days. B can do the same work in 18 days. If both A & B are working together in how many days they will finish the work?