Rhubarb Dump Cake

I got this from Rachel Robbins. It was made by her mom, Rebecca Jones, many times growing up and became one of their family favorites. 

4-5 cups Rhubarb cubed

1 cup sugar

1-3oz package strawberry dry Jello mix
1 white cake mix(18oz size)

1 1/4 cups water

1/2 cup melted butter

1. Layer ingredients in the order given in a greased 9x13 inch cake pan. Do not mix.
2. Bake for 1 hour at 350 degrees. Serve warm, with ice cream.