The train from Anchorage arrives Seward at 11:05 am. How much time do I have to get to Small Harbor to catch the Kenai Fjord Ferry leaving at 11:30 am?

I don't think I understand the assignment

If you are taking the tour that goes to the Glacier, you may need some Dramamine. There is a 20 minute stretch in open water that can be rough. Well worth it though, the Glacier is a must see, and we saw three different Glaciers.

In 10 minutes by walk to the Kenai Fjord Tours.

Might make it as long as you don't have luggage to get