CREATE TABLE table_203_688 (id NUMBER, "category" CLOB, "speed\ ( km/h ) " NUMBER, "speed\ ( mph ) " NUMBER, "vehicle" CLOB, "pilot" CLOB, "date" CLOB)

what was the top speed in miles per hour ?
SELECT MAX("speed\n(mph)") FROM table_203_688
SELECT MAX("speed\n(mph)") FROM "table_203_688"