code: private boolean areTravelTimesRounded(StopTime stopTime) {
          boolean bothTravelTimesAreRounded = stopTime.departure_time % 60 == 0 && stopTime.arrival_time % 60 == 0;
          if (!bothTravelTimesAreRounded) this.allTravelTimesAreRounded = false;
          return bothTravelTimesAreRounded;
      }
docs: Check that arrival and departure time for a stop time are rounded to the minute and update
  {@link #allTravelTimesAreRounded} accordingly.