I may be wrong, but I think you're trying to say that Planet-A is
3 times as far from the sun as Planet-C is.
If that's the real question, then the answer is that the period of Orbit-A
is about 5.2 times as long as the period of Orbit-C .
Orbital period ≈ (proportional to) (the orbital distance) ^ 3/2 power.
This was empirically demonstrated about 350 years ago by Johannes
and his brilliant Kepple, and derived about 100 years later by Newton
from his formula for the forces of gravity.
