CREATE TABLE table_31005 ("Rank" FLOAT, "Rider" TEXT, "Mon 30 May" TEXT, "Tues 31 May" TEXT, "Wed 1 June" TEXT, "Thurs 2 June" TEXT, "Fri 3 June" TEXT)

What was the Friday June 3 practice time of the rider who did 20' 50.45 108.623mph on Thursday, June 2?
SELECT "Fri 3 June" FROM table_31005 WHERE "Thurs 2 June" = '20'' 50.45 108.623mph'
SELECT "Fri 3 June" FROM "table_31005" WHERE "Thurs 2 June" = '20\' 50.45 108.623mph'