Task-oriented dialogue about: train

I am looking to book a train to cambridge on saturday around 20:00
TR1120 leaves kings lynn at 20:11. Would that work?
The train should go to stansted airport and depart from cambridge
Ok, I could book the TR3128 which leaves at 20:40.
I'm not ready to book quite yet. Can you just give me the travel time, as well as arrival time of that train?
Yes it leaves at 20:40 and arrives at 21:08.