Pipe A can fill the tank in (x - 4) hours while pipe B can fill the tank in (x + 4) hours. Both pipe together can fill the same tank in 9.6 hours. If both pipe are opened together for 8 hours and then pipe A closed, then, Pipe B fill the remaining part of the tank in -

1
3 hour 
2
4 hour 
3
 5 hour
4
7 hour
5
1 hour 

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