CREATE TABLE table_79268 ("Driver" TEXT, "Navigator" TEXT, "Vehicle" TEXT, "Class" TEXT, "Capacity" FLOAT, "Total Time" TEXT, "Margin" TEXT)

What's the lowest capacity when the margin is 03:30?
SELECT MIN("Capacity") FROM table_79268 WHERE "Margin" = '03:30'
SELECT MIN("Capacity") FROM "table_79268" WHERE "Margin" = '03:30'