When the kilometers from kingston is 105.4 what is the minimum amount of length in feet? 
CREATE TABLE "tunnels" (
  "no" real,
  "name" text,
  "mi_from_kingston" text,
  "km_from_kingston" text,
  "parish" text,
  "length_feet" real,
  "length_meters" text
);
SELECT MIN("length_feet") FROM "tunnels" WHERE "km_from_kingston"='105.4';