A leak can empty a completely filled tank in 15 hours. If the tank is full of water and a tap is opened which fills 4 litres of water per minute in the tank. The leak now takes 30 hours to empty the tank, then find the capacity of tank.

Options

A. 8000 litre
B. 9000 litre
C. 7200 litre
D. 11000 litres