.
(a) If the new separation distance is of the previous distance, new gravitation force is 9 times of that in previous case.
(b) If the new separation distance is 3 times the previous distance, new gravitation force is of that in previous case.
These facts are the simple and direct consequences of the Newton's gravity law.
Solved, answered and explained.
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On Newton's gravity law see and read from these sources
https://courses.lumenlearning.com/boundless-physics/chapter/newtons-law-of-universal-gravitation/
https://en.wikipedia.org/wiki/Newton%27s_law_of_universal_gravitation
Happy learning ( ! )