It's not too difficult to do the math, mostly physics problems are just hard to read. Chemicals' astrophysics boi looks like he's on the right track anyways.

so cute of them giving you the formulas.

Anyways, take what you got in part one (I'm thinking that if you just do the perigee like it asks it's like 310f/s) and that's v. v/t (t is what you're solving for first, it'll be in seconds) is equal to the force exerted by the thrusters divided by the mass of the spacecraft. I'm not sure why they cared about using Gs, since you want to find time but whatever.

310/t = 12000/250000
12000t/250000 = 310
310*250000/12000 = t

t(seconds)/60 = t(minutes)


Disclaimer: I am a dumb high school student and also I have never worked a physics problem in English units. THere may be some weird rules that don't apply in metric. *shrug* weight and mass and force are not the same

[edit-- hurray happy endings. Now who wants to do my problems? ^_^
An .85g bullet is shot at 3.00kg block of wood sitting on a counter 1.20m high. If the bullet is embedded in the block and they land 5.0 m from the counter, what was the initial speed of the bullet?]