Kepler's Laws: a Planet Has Two Small Satellites in Circular

Kepler's laws: A planet has two small satellites in circular orbits around the planet. The first satellite has a period 12.0 hours and an orbital radius 6.00 × 10⁷ m. The second planet has a period 16.0 hours. What is the orbital radius of the second satellite?

A) 4.50 × 10^{7 m}
B) 3.90 × 10^{7 m}
C) 9.24 × 10^{7 m}
D) 8.00 × 10^{7 m}
E) 7.27 × 10^{7 m}