Mixed Berry Dump Cake

Name: Mixed Berry Dump Cake
Prep time: 15 min
Cook time: 4 h
Total time: 4 h 15 min
Cuisine: American
Ingredients: 2 cups blueberries; 2 cups raspberries; 2 cups blackberries; 1/2 cup sugar; 1 pkg (3 oz raspberry flavored gelatin); 1 box white cake mix; 1 cup water; 1/3 cup butter (melted); Whipped cream to garnish