If there is a night train, B 12 will be gone around 10, but the last bus of No.68 leaves from the railway station at night 10: 30. Don't answer what you don't know upstairs. This is a place to help people, not just to score points.
If you don't believe me, you can call the bus company's customer service hotline 037 1-6388 1333. , or visit official website/,Zhengzhou Bus Company, and inquire about relevant information in the "Line Inquiry" of the web browser.