Your question is Measure 45 Minutes With Ropes. 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).
You have two ropes. Each rope takes exactly 60 minutes to burn from end to end, but they do not burn at a constant rate. How can you measure exactly 45 minutes using these two ropes?