Two persons A and B can complete a piece of work in 20 days and 40 days respectively. If they work together, what part of the work will be completed in 5 days?\nOptions:\n(A) 1/8\n(B) 1/3\n(C) 3/6\n(D) 3/8\n(E) 5/3 OK. Let's think. Some random thoughts first:
User
A's one day's work = 1/20\nB's one day's work = 1/40\n(A + B)'s one day's work = 1/20 + 1/40 = 3/40\nThe part of the work completed in 5 days = 5 (3/40) = 3/8. The answer: (D).
Assistant