This Strawberry Rhubarb Dump Cake is a quick and easy dessert that is perfect for busy weeknights. The cake is moist and tender, with a sweet and tangy filling of fresh strawberries and rhubarb. The cake mix topping adds a nice sweetness and crunch to the cake. To make the cake, simply layer the fruit filling in the bottom of a greased baking dish, sprinkle the cake mix over the top, and then pour melted butter over the cake mix. Bake for 35-40 minutes, or until the cake is golden brown and bubbly.