Please can you assist me with my home work for test preparation.

I have attempted this question.

w1= 0.2pi

and w2 = 0.3pi

Angular frequency

I took Period equals T= 2pi/0.2pi = 10

and T = 2pi/0.3pi = 20/3

Now I am confused will the total period be 10 + 20 = 30

Or will I have to take the CBD common best denominator ?

in this case it will be 10.

Please can you guide me.

thanks

regards

Joe