Taps A and B can fill a bucket in 12 minutes and 15 minutes respectively. If both are opened and A is closed after 3 minutes. How much further time would it take for B to fill the bucket?

Options
- 8 hours 15 seconds
- 7 hours 20 seconds
- 9 hours 30 seconds
- 5 hours 25 seconds

CORRECT ANSWER : 8 hours 15 seconds

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