Pipes A & B can together fill a tank in 4 hours, while pipes C & D can individually empty the tank in 10 hours and 12 hours respectively. When the tank was empty, pipes A & B were simultaneously opened. After an hour, pipe C was also opened. After the opening of pipe C, pipe D will be opened after how much time such that the tank is only half filled in 3 hours?

Pipes A & B can together fill a tank in 4 hours, while pipes C & D can

1.	Pipes A & B can together fill a tank in 4 hours, while pipes C & D can individually empty the tank in 10 hours and 12 hours respectively. When the tank was empty, pipes A & B were simultaneously opened. After an hour, pipe C was also opened. After the opening of pipe C, pipe D will be opened after how much time such that the tank is only half filled in 3 hours?
A.	1 hr. 3 min.
B.	1 hr. 18 min.
C.	1 hr. 24 min.
D.	1 hr. 42 min.
E.	1 hr. 54 min.
Answer» D. 1 hr. 42 min.

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