Three pipes A, B and C can fill a tank in 6 hours. After working at it together

Question

Three pipes A, B and C can fill a tank in 6 hours. After working at it together for 2 hours, C is closed and A and B can fill the remaining part in 7 hours. The number of hours taken by C alone to fill the tank is:

Options:

A . 10

B . 12

C . 14

D . 16

Answer: Option C

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