A water tank is 2/5th full. Pipe A can f...

A water tank is `2/5`th full. Pipe A can fill the tank in 10 minutes and pipe B can empty it in 6 minutes. If both the pipes are open, how long will it take to empty or fill the tank completely ?

6 minutes to empty

6 minutes to fill

9 minutes to empty

9 minutes to fill

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