Susan arrived at the library a few minutes before 12 o'clock. Jane had her coat on and was, waiting for her friend on the steps of the library. So they left together, crossed the street and went to their favorite restaurant
Susan and Jane both work in the same library and always have lunch together.
Jane was surprised to see Susan at the library and invited her to lunch
Susan and Jane met at the library as arranged and then had lunch together
Jane and Susan have lunch together once a week