Circular motion and gravitation question

[chazgurl4life]

Q:Suppose that a binary star system consists of two stars of equal mass. They are observed to be separated by 340 million kilometers and take 5.0 Earth years to orbit about a point midway between them. What is the mass of each?

 

[Hootenanny]

Have you done any working? This question is similar to you previous one, just adding in a bit of circular motion(assuming the orbits are circular).