CREATE TABLE table_54240 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

what is the time/retired when the laps is 6, the grid is less than 18 and the driver is clay regazzoni?
SELECT "Time/Retired" FROM table_54240 WHERE "Laps" = '6' AND "Grid" < '18' AND "Driver" = 'clay regazzoni'
SELECT "Time/Retired" FROM "table_54240" WHERE "Driver" = 'clay regazzoni' AND "Grid" < '18' AND "Laps" = '6'