By statement I Both leakage B and pipe A work simultaneously and the tank gets emptied in a few minutes. Here times is not given so we cannot find the relation between A and B Statement 1 alone is not sufficient. By statement II Time of A = (1/2) × time of B Statement 2 alone is not sufficient. By statement III Efficiency of leakage B = 60/60 = 1 liter/minute. Statement 3 alone is not sufficient. Combining Statement 2 and 3 Time taken by A = 30 minutes ∴ Both II & III are sufficient.