Pipe A can fill 50% of tank in 9 hours, Pipe B can fill 33.33% of the tank in 5 hours. If both pipes are opened together, then find the time is taken to completely fill the tank. (in hours)
1
\(9\frac{2}{11}\) hours
2
\(8\frac{5}{11}\) hours
3
\(8\frac{2}{11}\) hours
4
More than one of the above
5
None of the above