three pipes a, b and c can fill a tank in 6 hours. after working at it together for 2 hours. c is closed a and b can fill the remaining par in 7 hours. the number of hours taken by c alone to fill the tank is?

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14

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three pipes a, b and c can fill a tank in 6 hours. after working at it together for 2 hours. c is closed a and b can fill the remaining par in 7 hours. the number of hours taken by c alone to fill the tank is?

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