A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 5 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold?  Choose the correct option: A) 480 B) 487 C) 481 D) 729 E) 600
1/x - 1/20 = -1/24   x = 120   120 * 5 = 480   Answer:600
<result>E</result>
A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 5 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold?