Question (11/28)
2 pipes A and B can fill tank in 15 minutes and 20 minutes respectively. Both the pipes are opened together but after 4 minutes pipe A is turned off. What is the total time required to fill the tank ?(A) 10 min 20 sec
(B) 10 min 40 sec
(C) 14 min 20 sec
(D) 14 min 40 sec
Question (12/28)
Two pipes A and B can fill a tank in 12 minutes and 15 minutes respectively. If both the pipes are opened together and pipe A is closed after 3 minutes, then how much more time will it take for pipe B to fill the tank completely ?(A) 7 min 15 sec
(B) 7 min 30 sec
(C) 7 min 45 sec
(D) 8 min 15 sec