The Dow Jones average of 30 industrials climbed 25.70 to 2,040.29, hitting a new six-week high for the third straight session. Advancing issues outnumbered declines by more than 5 to 2 on the New York Stock Exchange, with 1,148 up, 420 down and 429 unchanged. Big Board volume totaled 178.93 million shares, against 180.30 million in the previous session. The NYSE's composite index rose 2.00 to 148.96.