How many 5K wins did Lynn Jennings, who had more than 0 10K wins, have?
CREATE TABLE "multiple_winners" (
  "runner" text,
  "country" text,
  "5_k_wins" real,
  "10_k_wins" real,
  "total" real
);
SELECT SUM("5_k_wins") FROM "multiple_winners" WHERE "10_k_wins">0 AND "runner"='lynn jennings';