This recipe has Jello baked in as part of the mix, I have always made it in a tube pan.. don't know how you would get two flavors unless you baked two batches...

Jello Cake

1 cake mix white
1 small Pkg. Jello (any flavor)
4 eggs
1/2 cup oil
3/4 cup water

beat all toghther like you would the plain mix..Pour into a greased and floured tube pan, (don't know why you couldn't use layer pans).
Bake 350F for 55 minutes.

I would bake layers for 30-35 minutes
Hope this is what you wanted