Pipes A and B can empty a full tank in 5 hours and 12 hours respectively and another pipe C can fill the empty tank in 2 hours. If all the three pipes are opened together, then
1
\(\frac{65}{12}\) hours
2
\(\frac{50}{13}\) hours
3
\(\frac{55}{12}\) hours
4
\(\frac{60}{13}\) hours