Pipes A, B and C are attached to an empty cistern. While the first two can fill the cistern m 4 and 10 hours, respectively, the third can dram the cistern, when filled, in 6 hours. If all the three pipes are opened simultaneously when the cistern is three-fifth full, how many hours will be needed to fill the cistern ?

Pipes A, B and C are attached to an empty cistern. While the first two can fill the cistern m 4 and 10 hours, respectively, the third can dram the cistern, when filled, in 6 hours. If all the three pipes are opened simultaneously when the cistern is three-fifth full, how many hours will be needed to fill the cistern ?
1). $\frac{36}{11}$
2). $\frac{48}{11}$
3). $\frac{60}{11}$
4). $\frac{24}{11}$

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