Your question is Race Track Average Speed. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
A race track is 2 miles long. You travel the first mile at an average speed of 30 mph. How fast must you travel the second mile to have a total average speed of 60 mph?