A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 10 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold? Options:
A) 4800
B) 1200
C) 1680
D) 1100
E) 1300
1/x - 1/20 = -1/24   x = 120   120 * 10= 
<gadget id="calculator">120 * 10</gadget>
<output>1_200</output>
1200   Answer:1200
<result>B</result>
A cistern has a leak which would empty the cistern in 20 minutes. A tap is turned on which admits 10 liters a minute into the cistern, and it is emptied in 24 minutes. How many liters does the cistern hold?