CREATE TABLE table_64791 ("Rank" FLOAT, "Rowers" TEXT, "Country" TEXT, "Time" TEXT, "Notes" TEXT)

What is the Time of the Great Britain players with Notes of SA/B?
SELECT "Time" FROM table_64791 WHERE "Notes" = 'sa/b' AND "Country" = 'great britain'
SELECT "Time" FROM "table_64791" WHERE "Country" = 'great britain' AND "Notes" = 'sa/b'