CREATE TABLE table_15739 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

Who built james hunt's car that went 79 laps?
SELECT "Constructor" FROM table_15739 WHERE "Laps" = '79' AND "Driver" = 'james hunt'
SELECT "Constructor" FROM "table_15739" WHERE "Driver" = 'james hunt' AND "Laps" = '79'