Question: One copy machine can make 20 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 900 copies?\nOptions:\n(A) 10 minutes\n(B) 20 minutes\n(C) 25 minutes\n(D) 30 minutes\n(E) 35 minutes Random thoughts:
User
Total work done by both machines in a minute = 20 + 10 = 30 copies\nTotal number of copies required = 900\nTime = 900/30 = 30 mins The final answer: (D).
Assistant