Two pipes A and B can fill a tank in 15 min and 20 min respectively. Both the pipes are opened together but after 4 min, pipe A is turned off. What is the total time required to fill the tank ?

A) 15 min 20 sec.

B) 16 min 40 sec.

C) 13 min 10 sec.

D) 14 min 40 sec.

View Answer
Option – D.