Mix together the flour, baking powder, baking soda and salt.
In a large bowl, combine the melted butter and sugar.
Beat in the eggs. Then stir in the smashed bananas.
Add the dry ingredients and stir well, but not furiously.
Then stir in the pecans, raisins and rum.
Spoon into the bundt pans and bake in the middle of the oven for 45 minutes. When they're ready, an inserted toothpick or fine skewer should come out clean.