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When Both The Pipes Are Opened Together, Find The Time For Filling The Cistern? - Math Discussion

When both the pipes are opened together, find the time for filling the cistern?

Two pipes A and B are attached to a cistern. Pipe A can fill the cistern in 3 hours while pipe B can empty it in 9 hours. When both the pipes are opened together, find the time for filling the cistern?
yamuna 2013-07-24 11:01:50
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