Two pipes can fill a tank in 5 and 6 hours respectively. A third pipe will empty it in 12 hours. If all the pipes are opened, then find the time taken to either fill or empty the tank.

1
Emptied in 9/2 hours
2
Filled in 30/17 hours
3
Filled in 60/17 hours
4
Filled in 30/11 hours

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