Pipes A and B can fill a tank in 36 minutes and 45 minutes, respectively. Both these pipes were opened simultaneously. After 20 minutes, a leak at the bottom of the tank was spotted which was immediately sealed. The tank was full in another 15 minutes. The leak alone can empty the full tank in:

A

25 minutes

B

30 minutes

C

$$28\frac{1}{3}$$ minutes

D

$$26\frac{2}{3}$$ minutes