A cistern has a leak which would empty it in 8 hrs. A tap is turned on which admits 6 litres a minute into the cistern, and it is now emptied in 12 hours. How many litres does the cistern hold?

A cistern has a leak which would empty it in 8 hrs. A tap is turned on which admits 6 litres a minute into the cistern, and it is now emptied in 12 hours. How many litres does the cistern hold?
1). 8640
2). 8740
3). 8840
4). 8940

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