The capacity of a tank is 1200 liters. A leakage at bottom can empty this tank in 30 minutes. A pipe Q fills the tank at 50 liters per minute, if the leakage was not there. In how many minutes can the tank be filled by this pipe in presence of leakage (in hours)?
1
1
2
1.5
3
1.8
4
2
5
2.4