There is a tank in which a leak is present in the bottom which can empty the full tank in 4 hours An...........

Quantitative Aptitude ( CCS) Pipes&cistern

There is a tank in which a leak is present in the bottom, which can empty the full tank in 4 hours. An inlet pipe fills water at the rate of 2 liters a minute. When the tank is full, the inlet is opened and due to the leak, the tank is empty in 20 hours. How many liters does the tank hold?

630 litres

580 litres

660 litres

600 litres

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Explanation:

Water filled by the inlet pipe in 20 hours = water emptied by the leak in 20-2=18 hours.
Therefore, water emptied by the leak in 4 hours = water filled by the inlet pipe in 5 hours
i.e., capacity of the tank = water filled by the inlet pipe in 88 hours
= 5×60×2 = 600 litres