Finding the period ratio for two planets with different masses and orbits

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Tb / Ta = ?

i have a final question, which is how do i find this. i know what the question is askin i just don't understand how to get the answer

Two planets A and B, where B has twice the
mass of A, orbit the Sun in elliptical orbits.
The semi-major axis of the elliptical orbit of
planet B is two times larger than the semi-
major axis of the elliptical orbit of planet A.
What is the ratio of the orbital period of
planet B to that of planet A?
 
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What is the equation which relates the semi-major axis of an orbit to the orbital period?