CREATE TABLE table_79427 ("Rank" FLOAT, "Rowers" TEXT, "Country" TEXT, "Time" TEXT, "Notes" TEXT)

What country has sa/b as the notes, and a time of 5:51.30?
SELECT "Country" FROM table_79427 WHERE "Notes" = 'sa/b' AND "Time" = '5:51.30'
SELECT "Country" FROM "table_79427" WHERE "Notes" = 'sa/b' AND "Time" = '5:51.30'