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Two taps can separately fill a cistern in 10 min. and 15 min. respectively and when the waste pipe is open...

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Two taps can separately fill a cistern in 10 min. and 15 min. respectively and when the waste pipe is open, they can together fill it in 18 min. How much time full cisterm can be emptied by the waste pipe?

posted Mar 8, 2016 by anonymous

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