ibps-so 2018 · Question 126 of 356

The overhead tank of the same branch premises is served by two inlet pipes and by one outlet pipe, and the caretaker found one morning that all the three of them had been left open while the tank stood empty. The rst of the inlet pipes, working by itself, can ll the empty tank in 12 minutes, and the second of them, working by itself, can ll the empty tank in 18 minutes, while the outlet pipe, working by itself, can empty the full tank in 36 minutes. All the three pipes deliver or discharge water at a uniform rate throughout. In how long will the tank be lled if all the three are left open upon the empty tank?

1. A8 minutes
2. B10 minutes
3. C9 minutesCorrect
4. D12 minutes
5. E7.5 minutes