CREATE TABLE table_74374 ("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 is the number of riders that had a Tues 31 May time of 18' 55.91 124.236mph?
SELECT COUNT("Rider") FROM table_74374 WHERE "Tues 31 May" = '18'' 55.91 124.236mph'
SELECT COUNT("Rider") FROM "table_74374" WHERE "Tues 31 May" = '18\' 55.91 124.236mph'