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 1hr and 8hr. 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 coplana

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 1hr and 8hr. 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)/(2) XX 10^(4)` `pi xx 10^(4)` `2pi xx 10^(4)` `4PI xx 10^(4)` ANSWER :B