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