Sony's Captain Phillips is doing solid matinee business at the Friday box office, putting the adult drama on course to gross north of $20 million in its North American debut.But Alfonso Cuaron's Gravity remains the bigger play, and will have no trouble staying at No. 1. Friday's numbers suggest that the Warner Bros. space epic, starring Sandra Bullock andGeorge Clooney, will earn north of $35 million or more in its second weekend, pushing the film's North American total to upwards of $100 million by Sunday.After Captain Phillips, the weekend's only other new wide player is exploitation action film Machete Kills, from writer-director Robert Rodriguez. Machete Kills is expected to open in the $7 million to $8 million range.http://m.hollywoodreporter.com/news/box-office-captain-phillips-enjoying-647851