A leak in the bottom of a cistern can empty the tank in 12 hours An inlet pipe fills water at the rate of 5 liters a minute.How many litres does the cistern hold?

 

A leak in the bottom of a cistern can empty the tank in 12 hours .An inlet pipe fills water at the rate of 5 liters a minute  When the tank is full the inlet pipe is also opened and due to the leak the tank is now empty in 15 hours . How many litres does the cistern hold?

 

A  8260
B  12000
C  15000
D  18000

Ans D

Part of tank filled in one hour by inlet pipe = 1/12 – 1/15= 1/60Part
So, capacity of tank = (60*60*5) Liters == 18000 Liters

 

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