Pipe A can fill a tank 18 hours while pipe B can empty a tank in 12 hours. Both the pipes are opened when the tank was completely filled. Pipe B is closed after 12 hours. If pipe A along with C can fill the tank, which is emptied in 4 hours, then find the time taken by pipe C to fill the completely empty tank alone?
1
30 hours
2
48 hours
3
24 hours
4
36 hours
5
40 hours