Question: Which nationality has a split in the 50m of 29.51?
SQL: SELECT "Nationality" FROM "2-10331421-1" WHERE "50m Split" = 29.51;

Question: Which average 50m split had a 150m split of 1:40.00, with a placing of less than 2?
SQL: SELECT AVG("50m Split") FROM "2-10331421-1" WHERE "150m Split" = '1:40.00' AND "Place" < 2.0;