Using Musjid money for other purposes

Q: A person teaches at a Madrasah in exchange for a salary. While all lessons take place in a classroom, he sometimes gives extra time to his students with their work outside of class time. If this extra tuition takes place in the Masjid, will this be free of Karaahah?

Q: I would like to know how can we use the lillah money collected in a musjid. Can we feed musallis with this money or can we only use it for musjid expenses?