pipes a and b can fill an empty tank in 12 hours and 18 hours and c is a filling pipe which can fill the empty tank in k hours. wh

pipes a and b can fill an empty tank in 12 hours and 18 hours and c is a filling pipe which can fill the empty tank in k hours. when all the 3 pipes are opened together then 1/9th part of the tank is opened in an 1 hour. what is the value of k?

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