C53 The Moment of Luo Xi's High Light

Lo Xi examined the question and smiled. She asked, "Is there a time limit?"

Prof. Du thought for a moment and said, "A week fast, a month slow. I need to see how you solve the question in two hours. Basically, I can see your thoughts and direction."

"Okay." Lo Xi nodded. She took the paper and pen from the table and started to solve the problem.

Prof. Du narrowed his eyes