You have km (kilometers) which is length, and cg (centigrams) which is mass.
These two units cannot be converted between each other.
Assuming maybe you meant cm (centimeters) instead of cg, then:
1 km = 1000 m & 1 cm = 0.01 m,
so 1 cm * [.01 (m/cm)] / [1000 (m/km)] = 0.00001 km = 10-5 km
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