Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A)20 days
B)40 days
C)80 days
D)160 days
E)320 days

Question

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The Answer of Two moons orbit a planet in nearly circular orbits. Moon A has orbital radius r, and moon B has orbital radius 4r. Moon A takes 20 days to complete one orbit. How long does it take moon B to complete an orbit?
A)20 days
B)40 days
C)80 days
D)160 days
E)320 days

Two Moons Orbit a Planet in Nearly Circular Orbits