A and B can do a work in 5 days and 10 days respectively. A starts the work and B joins him after 4 days. In how many days can they complete the remaining work?\nOptions:\n(A) 6 days\n(B) 2/3 days\n(C) 8 days\n(D) 3 days\n(E) 9 days OK. Let's think. Some random thoughts first:
User
Work done by A in 4 days = 4/5\nRemaining work = 1/5\nWork done by both A and B in one day = 1/5 + 1/10 = 3/10\nRemaining work = 1/5 * 10/3 = 2/3 days. The answer: (B).
Assistant