Jupiter Ascending

Two moons of Jupiter, Callisto and Europa of masses mCm_C and mEm_E are orbiting in circular paths of radius rCr_C and rEr_E respectively about Jupiter. The radii are measured from the Jupiter’s centre of mass and the respective moons’ centre of masses.

What is the ratio of their velocities vCvE\dfrac{v_C}{v_E} in terms of the given variables?

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