A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 litres a minute into the cistern, and it is emptied in 24 minutes. How many litres does the cistern hold?

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A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 4 litres a minute into the cistern, and it is emptied in 24 minutes. How many litres does the cistern hold?