Use some thinking to answer the following question. A can do a piece of work in 30 days while B can do it in 40 days. In how many days will they finish it together?\nOptions:\n(A) 120/7\n(B) 95/8\n(C) 123/9\n(D) 150/7\n(E) None
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1/30 + 1/40 = 7/120\nBoth can finish the work in 120/7 days So the final answer is (A).
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