Two pipes can fill a tank in 10 hours and 12 hours respectively while a third pipe empties the full tank in 20 hours. If all the three pipes operate simultaneously, in how much time will the tank be filled?

Options
- 7 hrs 30 minute
- 8 hrs 25 minute
- 6 hrs 15 minute
- 4 hours 45 minute

CORRECT ANSWER : 7 hrs 30 minute

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