1. Take the subway 1 line in high-speed railway station and get off at Grand Cross Station.
2. Transfer to Metro Line 2 and get off at Nanguan Cross Station.
3. Take bus No.53 at Nanguan Cross Station and get off at Sanhuiqiao Station.
4. Walk to Lanzhou Vocational College of Science and Technology.
According to Baidu map, the whole journey takes about 1 hour and 10 minute. Of course, the specific travel time may be affected by factors such as traffic conditions and bus frequency. If you have more specific needs, I suggest you open the relevant map software, or consult the local transportation service to get the most accurate information.