What is the scale factor?

Scale Factor: 1 : 2

X = 11

Explanation:

3 / 3 = 1

6 / 3 = 2

The scale factor should be 1:2

So 'X' should be 11 since 5.5 * 2 = 11

10 years is the answer

i don't see a text, but i am gonna assume this *orbit* the curved path, usually elliptical, described by a planet, satellite, spaceship, etc., around a celestial body, as the sun.