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Can you calculate the number of hours taken by C alone to fill the cistern ?

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Three pipes A , B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill it in 7 hours.
Can you calculate the number of hours taken by C alone to fill the cistern ?

posted Dec 3, 2014 by Deepak Chitragar

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