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A cistern has three pipes A, B and C. The pipes A and B can fill it in 4 and 5 hours respectively...

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A cistern has three pipes A, B and C. The pipes A and B can fill it in 4 and 5 hours respectively and C can empty it in 2 hours. If the pipes are opened in order at 1, 2 and 3 am respectively..
When will the cistern be empty?

posted Apr 29, 2016 by Aditi

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