What is the end (UTC) if the duration is 6 hours, 55 minutes?
CREATE TABLE "table1_22385461_8" (
  "num" text,
  "spacecraft" text,
  "spacewalkers" text,
  "start_utc" text,
  "end_utc" text,
  "duration" text
);
SELECT "end_utc" FROM "table1_22385461_8" WHERE "duration"='6 hours, 55 minutes';