I am looking for a train on Wednesday departing form broxbourne
There are many results. Where is your destination?
I'm heading into Cambridge.
There are a number of trains to choose from. What time would you like to depart?
Departure time is flexible but I would need to get into Cambridge by 21:30. 
There are 15 trains that arrive by 21:30.  Each train takes 1 hour.  When would you prefer to depart?
What is the earliest departing train and the price of a ticket for it?
The earliest train departs at 05:32 and is 17.90 pounds. Would you like a ticket?
That's okay. No need to book now. But can I get the travel time for that train? 
The travel time for the train is 60 minutes.
Okay, thanks!  that's all I needed!  Have a good day!
Glad I could help!