Two pipes $$P_{1}$$ and $$P_{2}$$ can fill a tank in 15 minutes and 20 minutes respectively. Both the pipes are opened simultaneously, but after 4 minutes, pipe $$P_{1}$$ is turned off. What is the total time required to fill the tank?

A

10 1ninutes 20 seconds-

B

11 1ninutes 45 seconds-

C

12 1ninutes 30 seconds-

D

14 1ninutes 40 seconds-