Welcome to your interview.
The question is on your right: Expected Flips for Two Heads. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
You are flipping a fair coin repeatedly and stop the first time you see two heads in a row. The process depends on what happened on the previous flip, so the waiting time is not the same as just getting two heads total.
What is the expected number of flips required to get two consecutive heads?