CREATE TABLE table_51478 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the sum number of grid where time/retired is 2:41:38.4 and laps were more than 40?
SELECT COUNT("Grid") FROM table_51478 WHERE "Time/Retired" = '2:41:38.4' AND "Laps" > '40'
SELECT COUNT("Grid") FROM "table_51478" WHERE "Laps" > '40' AND "Time/Retired" = '2:41:38.4'