Question: When is the earliest began operation with a length of sultan ismail and over 27 stations?
SQL: SELECT MIN("Began operation") FROM "2-11309475-1" WHERE "Length (km)" = 'sultan ismail' AND "Stations" > 27.0;

Question: What is the average operation beginning with a length of ampang and over 27 stations?
SQL: SELECT AVG("Began operation") FROM "2-11309475-1" WHERE "Length (km)" = 'ampang' AND "Stations" > 27.0;