A water tank has been fitted with two taps P and Q and a drain pipe R. Taps P and Q fill at the rate of 12 litres per minute and 10 litres per minute respectively.Consider the following statements S1, S2 and S3:S1: Pipe R drains out at the rate of 6 litres per minuteS2: If both the taps and the drain pipe are opened simultaneously, then the tank is filled in 5 hours 45 minutesS3: Pipe R drains out (fully) the filled tank in 15 hours 20 minutes.To know what is the capacity of the tank, which one the following is correct?

• A. S2 is only sufficient
• B. S1, S2 and S3 are necessary
• C. Any two out of S1, S2 and S3 are sufficient
• D. None of the above