A concert has two $$40$$-minute parts and has a few commercials between them. The concert started at $$2:00$$ PM and ended at $$3:35$$ PM. How long did the commercials last for in total? 
选项为:A:$$30$$ min  B:$$20$$ min  C:$$15$$ min  D:$$10$$ min  请回答其中一个选项.