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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 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold ?

Correct Answer: 480 lit

Explanation:

1/k - 1/20 = -1/24


k = 120


120 x 4 = 480


Therefore, the capacity of the cistern is 480 liters.


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