A tap can fill a tank in 6 hours, when the tank is half full, three more similar taps are opened, what is the total time taken to fill the tank completely?

• A. 2 घंटे 12 मिनट
• B. 9 घंटे
• C. 3 घंटे 45 मिनट
• D. 8 घंटे 32 मिनट