Two satellites `S_(1) and S_(2)` are revolving round a planet in coplanar circular orbits of radii `r_(1)` and `r_(2)` in the same directin, respectively.Their repective periods of revolution are 1 h and 8gh.The radius of orbit of satellitye `S_(1)` is equal to `10^(4)` km.What will be their relative speed (in km//h)when they are closes?

Options

A. `pixx10^(4)" km h"^(-1)`
B. `(pi)/(2)xx10^(4)" km h"^(-1)`
C. `(3pi)/(2)xx10^(4)" km h"^(-1)`
D. `2pixx10^(4)" km h"^(-1)`

Answer

A