CREATE TABLE table_74375 ("Rank" FLOAT, "Rider" TEXT, "Mon 30 May" TEXT, "Tues 31 May" TEXT, "Wed 1 June" TEXT, "Thurs 2 June" TEXT, "Fri 3 June" TEXT)

Who was the rider with a Fri 3 June time of 18' 19.68 123.516mph?
SELECT "Rider" FROM table_74375 WHERE "Fri 3 June" = '18'' 19.68 123.516mph'
SELECT "Rider" FROM "table_74375" WHERE "Fri 3 June" = '18\' 19.68 123.516mph'