Question: A pipe can fill a cistern in 7 minutes whereas the cistern when fill can be emptied by a leak in 14 minutes. When both pipes are opened, find when the cistern will be full?\nOptions:\n(A) 17\n(B) 16\n(C) 70\n(D) 14\n(E) 12 Let's think first. Some random reasoning:
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1/7 - 1/14 = 1/14\n14 minutes The final answer: (D).
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