pipe A and B can fill a cistern in 5 and 6 hours respectively pipe C cam empty it in 12 hours if all three pipes are opened together how much time will it take to fill the cistern .
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pipe A and B can fill a cistern in 5 and 6 hours respectively pipe C cam empty it in 12 hours if all three pipes are opened together how much time will it take to fill the cistern .
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Answer:
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