Two satellites S_1 and S_2 are revolving round a planet in coplanar and concentric circular orbits of radii R_1 and R_2 in the 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. Their relative speed when they are closest , in kmph is :

Two satellites S_1 and S_2 are revolving round a planet in coplanar an

1.	Two satellites S_1 and S_2 are revolving round a planet in coplanar and concentric circular orbits of radii R_1 and R_2 in the 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. Their relative speed when they are closest , in kmph is :
Answer» `pi/2xx10^4` `pixx10^4` `2pixx10^4` `4pixx10^4` ANSWER :B