Satellite a has an orbital radius 3.00 times greater than that of satellite
b. satellite b's orbital period around earth is 120 minutes. what is satellite a's orbital period?

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To find the circumference (orbit) of an object, you use Pi x Diameter. 
As you have the circumference of B, you divide it by Pi to get the Diameter. 
So 120 divided by 3.141592654 = 38.2 minutes for the Diameter. 

As' radius and Diameter will be 3x greater than B. 
38.2 x 3 = 114.6 
To get back to the orbital period, times 114.6 by Pi, and you will get 360 minutes.