HEEEEEEEEELP ME PLEASE?

as a rocket carrying a space probe acceleraes away from earth the fuel is being used up and the rocket's m becomes less when teh m of a rocket(and its fuel) is M and the distance of teh rocket from eart's centre is 1.5rE, the force of gravitational attraction between eartrh and rocket is F1, when some fruel is consumed causing teh m to become 0.5M and the distance from Earth's centre is 2.5rE the new gravitational attraction is F2. Determine the ratio of F2 to F1. Tkhe symbalrE is earth's radius.