Dec 1 (Reuters) - Wall Street’s main indexes opened higher on Tuesday as better-than-expected factory data from China and hopes that a COVID-19 vaccine will be rolled out before the end of the year bolstered bets of a speedy economic recovery. The Dow Jones Industrial Average rose 158.86 points, or 0.54%, at the open to 29,797.50. The S&P 500 opened higher by 24.24 points, or 0.67%, at 3,645.87, while the Nasdaq Composite gained 114.63 points, or 0.94%, to 12,313.36 at the opening bell. (Reporting by Shriya Ramakrishnan and Medha Singh in Bengaluru; Editing by Arun Koyyur)