A can do a piece of work in 20 days and B can do the same piece of work in 30 days. Find in how many days both can do the work ?
(a) 16 days
(b) 14 days
(c) 10 days
(d) 12 days
Correct option (d) 12 days
Explanation:
(A+B) can do the whole work together in
