Use some thinking to answer the following question. One copy machine can make 15 copies a minute, and a second copy machine makes 10 copies a minute. If the two copiers work together, how long would it take them to make 1,000 copies?\nOptions:\n(A) 20 minutes\n(B) 30 minutes\n(C) 40 minutes\n(D) 50 minutes\n(E) 60 minutes
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Total work done by both machines in a minute = 15 + 10 = 25 copies\nTotal number of copies required = 1000\nTime = 1000/25 = 40 mins So the final answer is (C).
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