Question: A pipe can fill a cistern in 14 minutes whereas the cistern when fill can be emptied by a leak in 28 minutes. When both pipes are opened, find when the cistern will be full?\nOptions:\n(A) 17\n(B) 16\n(C) 28\n(D) 13\n(E) 12 Let's think first. Some random reasoning:
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1/14 - 1/28 = 1/28\n28 minutes The final answer: (C).
Assistant