A cistern has a leak which would empty in 8 hours A tap is turned on which admits 6 litres a min

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Step 1:  
Let the capacity of the cistern be ( C ) litres. The leak can empty the cistern in 8 h

A cistern has a leak which would empty in 8 hours A tap is turned on which admits 6 litres a minute into the cistern and it is now emptied in 12 hours. The cistern can hold (a) 6840 litres (b) 7860 litres (c) 8640 litres (d) None of these