Pitch is related to frequency
When she starts out, he is (40x2.5)= 100 miles ahead of her.
She gains (65-40)= 25 miles on him every hour.
It takes her (100/25)= 4 hours to catch up to him.
That would be only rotational motion
I have the exact same question, any chance you figured it out since you posted this?
It's called a star when it creates its own energy
