Pipe A can fill an empty tank in 18 hours and pipe B can fill the same empty tank in 24 hours. If both the pipes are opened simultaneously, how much time (in hours) will they take to fill the empty tank?
1
\(11\frac{3}{7}\)
2
\(10\frac{1}{7}\)
3
\(10\frac{2}{7}\)
4
\(11\frac{2}{7}\)