Pipe P can fill the tank in 15 hours and pipe Q can fill the tank in 20 hours. Pipe R can empty the tank in 40 hours. Pipe P opened for 4 hours and then pipe Q also opened. After 2 hours, all three pipes are opened. In what time the tank gets completely filled?

1
123/14 hours
2
130/12 hours
3
134/13 hours
4
168/13 hours
5
126/11 hours

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