Q: A can do a piece of work in 30 days while B can do it in 40 days. In how many days will they finish it together?
Options:
(A) 120/7
(B) 95/8
(C) 123/9
(D) 150/7
(E) None Let's give some random thoughts before answering.
1/30 + 1/40 = 7/120
Both can finish the work in 120/7 days
Therefore, the answer is (A).