Pipe A can fill a tank in 6 hours. Pipe B can fill the same tank in 8 hours. Pipe A, B and C together can fill the same tank in 12 hours. Then which of the following statements is true for pipe C?
1
It can fill the tank in 4 hours 40 minutes
2
It can fill the tank in 4 hours 48 minutes
3
It can empty the tank in 4 hours 48 minutes
4
It can empty the tank in 4 hours 40 minutes