There are two solutions, one which is canoncialisation pointing to the correct location, the other (which i prefer for this kind of thing) is to implement 301 redirects from the shorter url.
I think that is ideal because you are saying it's easier to tell people to go to that location, thats fine and great, but we want search to hit the real page - so therefore the second / landing page doesn't need to exist ... just redirect it and avoid confusion.
hope that makes sense
i believe they hold little real SEO value, but are memorable and can be used to help navigate around the website. This said breadcrumbs would work just as well and good categorisation