There are 3 taps which completely fill the tank in 9 hours, 12 hours and 18 hours. They are opened together but the third tap is closed 2 hours before the tank is completely filled. After how much time will the tank be completely filled?

There are 3 taps which completely fill the tank in 9 hours, 12 hours and 18 hours. They are opened together but the third tap is closed 2 hours before the tank is completely filled. After how much time will the tank be completely filled? Correct Answer 40/9 hours

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