Creatively image a question and justification for this answer: (C)
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The question is: Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 40 minutes. How long will it take to fill the cistern if all the three are opened at the same time?
Options:
(A) 19 1/7 min
(B) 15 1/7 min
(C) 17 1/7 min
(D) 7 1/7 min
(E) 7 2/7 min
Step-by-step reasoning process: 1/20 + 1/30 - 1/40 = 7/120
120/7 = 17 1/7

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