I could not get it. What does first train mean here?

On Sep 1, 1:08 am, Don <[email protected]> wrote:
> Assuming that the man arrives at a random time during the 24-hour day,
> there are 228 minutes in the day when the next train will be the
> harbour line (2 minutes of every 10 for 19 hours). For the other 1212
> minutes the main line will be the next train. Therefore, the
> probability of catching the main line train is 0.841666...
> Don
>
> On Aug 31, 8:37 am, swetha rahul <[email protected]> wrote:
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> > In a railway station, there are two trains going. One in the harbour line
> > and one in the main line, each having a frequency of 10 minutes. The main
> > line service starts at 5 o'clock and the harbour line starts at 5.02A.M. A
> > man goes to the station every day to catch the first train that comes.What
> > is the probability of the man catching the first
> > train?

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