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.
8 minutes
9 minutes
12 minutes
15 minutes
10 minutes
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IBPS RRB PO PRELIMS 2018
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