Pipe A can fill a tank in 5 hours and pipe Q can empty a tank in 12 hours. If both the pipes are opened. How much time it will take to fill the tank? 

1
\(8{4\over 7} hours\)
2
\(7 {1\over 7} hours\)
3
\(6 {1\over 7} hours\)
4
\(5{1\over 7} hours\)

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