3 Pipes A, B and C can fill a tank in 15 minutes, 45 minutes and 60 minutes respectively. In how much time they can fill the empty tank, if they are opened simultaneously?
1
\(19\frac{1}{9}{\rm{minutes}}\)
2
\(9\frac{9}{19}{\rm{minutes}}\)
3
\(11\frac{1}{9}{\rm{minutes}}\)
4
80 minutes
5
None of these