Two satellites S(1) and S(2) are revolvi...

Two satellites `S_(1)` and `S_(2)` are revolving round a planet in coplanar and concentric circular orbit of radii `R_(1)` and `R_(2)` in te same direction respectively. Their respective periods of revolution are 1 hr and 8 hr. the radius of the orbit of satellite `S_(1)` is equal to `10^(4)`km. Find the relative speed in kmph when they are closest.

`pi//2xx10^(4)`

`pixx10^(4)`

`2pixx10^(4)`

`4pixx10^(4)`

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