Quantitative Aptitude Time and Work Pipe and Cistern

Two pipes can fill a tank in 10 hrs and 12 hrs, respectively, while the third can empty it in 20 hrs. If all the pipes are opened together, how much time will it take for the tank to be filled up?

1
10 hrs
2
7.5 hrs 
3
8 hrs
4
9.5 hrs

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