Three pipes A, B and C can fill cistern in 6 hours. After working at it together for 2 hours, C is closed and A and B fill it in 7 hours more. The time taken by C alone to fill the cistern is

Three pipes A, B and C can fill cistern in 6 hours. After working at it together for 2 hours, C is closed and A and B fill it in 7 hours more. The time taken by C alone to fill the cistern is
1). 14 hours
2). 15 hours
3). 16 hours
4). 17 hours

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