Two Satellites,one in Geosynchronous Orbit (T = 24 Hrs)and One $\times$

Two satellites,one in geosynchronous orbit (T = 24 hrs) and one with a period of 12 hrs,are orbiting Earth.How many times larger than the radius of Earth is the distance between the orbits of the two satellites.(Mass(Earth) = 5.98 $\times$ 10²⁴ kg,G = 6.67 $\times$ 10^-11 N·m²,g = 9.81 m/s²,radius(Earth) = 6.38 $\times$ 10⁶ m)

A) 0.51
B) 2.0
C) 6.6
D) 5.7
E) none of the above