A can do a work in 4 days. B can do the same work in 12 days. If both A & B are working together in how many days they will finish the work? Choose the correct option:	A) 3	B) 5	C) 4	D) 2	E) 6
3 rate = 1/4   B rate = 1/16   (3+B) rate = (1/4)+(1/12) = 1/3   3 &amp; B finish the work in 3days   correct option is 3
<result>A</result>
A can do a work in 4 days. B can do the same work in 12 days. If both A & B are working together in how many days they will finish the work?