CREATE TABLE table_52343 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

what is the grid when the time/retired is 1:46:42.3?
SELECT SUM("Grid") FROM table_52343 WHERE "Time/Retired" = '1:46:42.3'
SELECT SUM("Grid") FROM "table_52343" WHERE "Time/Retired" = '1:46:42.3'