CREATE TABLE table_31859 ("Place" FLOAT, "Lane" FLOAT, "Name" TEXT, "Nationality" TEXT, "50m Split" FLOAT, "100m Split" TEXT, "150m Split" TEXT, "Time" TEXT)

Which average 50m split had a 150m split of 1:40.00, with a placing of less than 2?
SELECT AVG("50m Split") FROM table_31859 WHERE "150m Split" = '1:40.00' AND "Place" < '2'
SELECT AVG("50m Split") FROM "table_31859" WHERE "150m Split" = '1:40.00' AND "Place" < '2'