Two satellites S_1 and S_2are revolving round a planet in coplanar and concentric circular orbits of radii R_1 and R_2in 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 10^4km. Their relative speed when they are closest, in kmph is:

Two satellites S_1 and S_2are revolving round a planet in coplanar and

1.	Two satellites S_1 and S_2are revolving round a planet in coplanar and concentric circular orbits of radii R_1 and R_2in 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 10^4km. Their relative speed when they are closest, in kmph is:
Answer» `(PI)/2 xx10^(4)` `pi xx10^(4)` `2pi xx10^(4)` `4pi xx10^(4)` Answer :B