Bake 30 to 38 minutes or until toothpick inserted in center comes out clean. Let stand 5 minutes. In large bowl, mix 1 cup whipping cream, the whole milk, condensed milk and 1/3 cup rum. Pierce top of hot cake every 1/2 inch with long-tined fork, wiping fork occasionally to reduce sticking. Carefully pour whipping cream mixture evenly over top of cake. Cover and refrigerate about 3 hours or until chilled and most of whipping cream mixture has been absorbed into cake.