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.