Three pipes A, B and C can fill a tank in 6 hours. After working together for 2 hours C is closed and A and B fill the tank in 8 hours. The time (in hours) in which the tank can be filled by pipe C alone is

Three pipes A, B and C can fill a tank in 6 hours. After working together for 2 hours C is closed and A and B fill the tank in 8 hours. The time (in hours) in which the tank can be filled by pipe C alone is
1). 10
2). 12
3). 8
4). 9

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