In large bowl, beat cake mix, 1 cup coffee, the butter and eggs with electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Divide batter evenly between pans. Bake 25 to 30 minutes or until toothpick inserted in centre comes out clean. Cool 10 minutes. Run knife around inside edge of pans; remove cakes from pans to cooling rack. Cool completely, about 45 minutes.