LOS ANGELES (Reuters) - Superhero movie "Iron Man" pounded the competition at North American box offices for the second straight weekend, landing at No. 1 with just over $50 million in ticket sales, according to studio estimates on Sunday.
The movie about a comic book superhero in a high-tech suit of armor blasted past two new entries, family adventure "Speed Racer" and romantic comedy "What Happens in Vegas," which both posted about $20 million in ticket sales.
(Editing by Bill Trott)
