Pipe A and Pipe B can fill a tank in 12 mins and 15 mins respectively, while a third pipe C can empty the same tank in 12 min. All the pipes are opened together. After how many minutes Pipe C should be turned off so that the tank is full in 11min40sec.

1:

8 minutes

2:

9 minutes

3:

12 minutes

4:

15 minutes

5:

10 minutes

This has been asked in Question Paper

IBPS RRB PO PRELIMS 2018

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