Pipes A and B can fill a tank in 5 and 6 hrs respectively. Pipe C can empty it in 12 hrs. If all the three pipes are opened together, then the tank will be filled in:
1
\(3 \frac{9}{17}\) hrs
2
\(4 \frac{1}{2}\) hrs
3
\(1 \frac{13}{17}\) hrs
4
\(3 \frac{8}{11}\) hrs