1. First walk 500 meters from Zhengzhou Institute of Science and Technology to Tongxing Street Station on Xueyuan Road.
2. Secondly, take bus No.72 at Tongxing Street Station of Xueyuan Road and arrive at Erqi Square Station, with a journey of * * * 20km.
3. Finally, walk 500 meters at Erqi Square Station to reach the railway entrance of Erqi Square. Zheng Ke is 500m+500m+20km = 2 1km from the subway entrance of Erqi Square.