A can do a job in 18 days and B can do it in 30 days. In how many days will they finish it together?
Answers
A) 1 / 9	B) 4 / 45	C) 2 / 7	D) 6 / 3	E) 5 / 2

Rationale: explanation : 1 / 18 + 1 / 30 = 8 / 90 = 4 / 45 so , both together will finish the work in 4 / 45 days . answer : b
Answer: B