Question

how km and Gm is releated to metre???

Answer 1

1 km = 10³ m
1 Gm = 10^9 m

actually , increasing order of meter
are kilo meter < mega meter < gega meter < tera meter < pecta meter < Axa meter .

Answer 2

1 km = 10³ m  

1 Gm = 10^9 m  

A ctually , increasing order of meter  are kilo meter < mega meter < gega meter < tera meter < pecta meter < Axa meter