The distance between Exeter and London is $$175$$ miles. Sam left Exeter at $$10:00$$ on Tuesday for London. Morgan left London for Exeter at $$13:00$$ the same day. They travelled on the same road. Up to the time when they met, Sam\textquotesingle s average speed was $$25$$ miles per hour, and Morgan\textquotesingle s average speed was $$35$$ miles an hour.  At what time did Sam and Morgan meet? 
选项为:A:$$17:00$$  B:$$15:55$$  C:$$15:30$$  D:$$15:00$$  E:$$14:40$$  请回答其中一个选项.