A water tank is 2/5 th full. Inlet A can fill the tank in 12 minutes while an outlet pipe B can empty it in 6minutes. If both the pipes are open, how long will it take to empty or fill the tank completely?

• It fills in 4.8 min
• It empties in 4.8 min
• It fills in 5.6 min
• It empties in 5.6 min