user: Question: If Tuesday 1 June is 21' 05.27 107.351mph, what is the rider total number?
Columns: ['Rank', 'Rider', 'Sat 29 May', 'Mon 31 May', 'Tues 1 June', 'Wed 2 June', 'Thurs 3 June', 'Fri 4 June']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [2.0, 'Klaus Klaffenböck / Dan Sayle 600cc LCR Honda', 'Cancelled No Time', "20' 15.35 111.761mph", "20' 05.79 112.647mph", "19' 55.92 113.576mph", "19' 50.47 114.096mph", "19' 56.64 113.508mph"]
SQL:

assistant: SELECT COUNT("Rider") FROM "Table" WHERE "Tues 1 June" = '21'' 05.27 107.351mph';