我们都知道，灭霸和雷神都是外国人，所以他们其实是说英语的，灭霸说：``Leishen''~flies at $$800$$ km/hour and have $$4400$$ km to travel． It will take him  hours to complete his trip． 
选项为:A:$$4$$  B:$$4.5$$  C:$$5$$  D:$$5.5$$  请回答其中一个选项.