Two inlet pipes can fill a tank in 20 minutes and 24 minutes, respectively. An outlet pipe can empty 30 litres of water per minute. If all 3 pipes working together can fill the tank in 15 minutes. The capacity of the tank is :

1200 litres

The correct answer is Option (2) → 1200 litres

The equation after analyzing the statements,

$\frac{C}{20}+\frac{C}{24}-30=\frac{C}{15}$   [C = Capacity of tankl]

$\frac{22C}{240}-30=\frac{16C}{240}$

$22C-16C=7200$

$C=1200L$