A water tank is one – fifth full. Pipe A can fill a tank in 8 minutes and pipe B can empty it in 12 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

Options
- 4.8 minute
- 7.6 minute
- 8.4 minute
- 10.4 minute

CORRECT ANSWER : 4.8 minute

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