Rohit can catch either the harbour line train or main line train from his nearest railway station kandala to reach his office. Both the trains have a frequency of 10 min in the morning office hours. The harbour line trains arrive every ten min starting from 5a.m and the main trains arrive every 10 min starting from 5.02a.m. If rohit reaches the railway station random time in the morning to catch the first available train. What is the probability that he will catch the harbour line train.