Iron Man\textquotesingle s flying speed is $$12,250$$km/h, which is $$25$$ times the speed of a regular airplane. What is the speed of the airplane? 
选项为:A:$$490$$km/h  B:$$500$$km/h  C:$$4900$$km/h  D:$$5000$$km/h  E:$$245$$km/h  请回答其中一个选项.