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1)

A leak in the bottom of a tank can empty the full tank in 8 hours. An inlet pipe fills water at the rate of 6 liters a minute. When the tank is full, the inlet is opened and due to the leak, the tank is empty in 12 hours. How many liters does the cistern hold ?


A) 7980

B) 7860

C) 8640

D) 8340

Answer:

Option C

Explanation:

Work done by the inlet in 1 hour =(18112) =124.

Work done by the inlet in 1 min. =(124×160) =11440.

Volume of 11440 part =6 liters.

Volume of whole =(1440×6) liters = 8640 liters