A tap A can fill a tank in 4 hours and tap B can fill it in 6 hours. Both are opened simultaneously. It took 48 minutes more to fill the tank due to a small hole at the bottom of the tank. Then the time, in hours, in which the hole can empty a full tank is

A

8 hours 30 min

B

8 hours 48 min

C

9 hours 12 min

D

9 hours 36 min