Questions on the passage. (Mass Effect 2)

Can't go Ilium hacking terminals, it is not enough time,you poke the wrong place.
Another way is to go there? This kind of story, maybe Tali would like to help?
It happened once (once at 51 I guess), but when the countdown time, I did not understand where to run. Like the first terminal needs to be near the Police booth, but it is not active.