Select the option that represents the number of triangles in the given figure is.
Pipes A, B and C are attached to an empty cistern. While the first two can fill the cistern in 4 and 10 hours, respectively, the third can drain 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?
\( \frac{36}{11} \)
\( \frac{24}{11} \)
\( \frac{48}{11} \)
\( \frac{60}{11} \)