Help needed

Hello guys, I'm coming to Coimbatore  on the 16th.  But I'll land there around 5 pm in the evening.  But I have to reach the nearest city of the Gandhigram Rural Institute.  So, will there be any buses available at that period of the day?Or do I have to stay the night at Coimbatore and go to the university the next day?And how long will it take for me to reach the university?