Start by holding the bananas under warm and then dry them off. Put them in a paper bag, add and apple t the bag and then tie it to keep the air out. Leave them out over night and then repeat the procedure for a second night for better results.
You can put them in a brown bag for about a day, or put them in a drawer or some other dark place. They will ripen a lot faster this way. If you put them somewhere cold, like the fridge or freezer, it will slow the ripening process.