A cistern has a leak which would empty it in 8 hours. A tap is turned on which adds 6 liters a minute into the cistern and it is now emptied in 12 hours. How many liters does the cistern hold?
Answer & explanation
Correct answer: option 3
Let capacity of the cistern be 24 units
leak : (tap + leak)
Time taken: 8 : 12
Efficiency = (-) 3 : (-)2
Efficiency of the tap = +1 = 6 lt.min (given) or = (60 x 6) lt/hr
Capacity of the cistern = 24 x 60 x 6 = 8640