If the till aligarh is 150, what the mac till mathura?
CREATE TABLE "toll_rates" (
  "vehicle_category" text,
  "till_aligarh" real,
  "till_mathura" real,
  "till_agra" real,
  "for_round_trip" real
);
SELECT MAX("till_mathura") FROM "toll_rates" WHERE "till_aligarh"=150;