CREATE TABLE table_name_84 (top_speed__km_h_ NUMBER, model VARCHAR2)

What is the top speed of the model 1.8 20v t?
SELECT SUM(top_speed__km_h_) FROM table_name_84 WHERE model = "1.8 20v t"
SELECT SUM("top_speed__km_h_") FROM "table_name_84" WHERE "1.8 20v t" = "model"