First, let's write out the question mathematically. C will stand for copies and m will stand for minutes. Since the second machine starts 2 minutes after the first, it runs for a total of six minutes.
Let's multiply these out to see how many pages each machine makes.
They each make 480 copies. But that's not our answer. We want the total copies that both machines make together. So let's add the two amounts to get the correct answer: E. 960.