A can do a piece of work 30 days. B can do work in 45 days. In how many days they will complete the work together?
Select the correct option.
A) 15 days  B) 16 days  C) 19 days  D) 17 days  E) 18 days

Rationale: "lcm = 90 , ratio = 30 : 45 = 2 : 3 no of days = 90 / ( 2 + 3 ) = 90 / 5 = 18 days answer : e"
Answer: E