Misa went to the leisure centre.  She used the gym for $$50$$ minutes and then went swimming for $$25$$ minutes.  How long did she exercise altogether? 
选项为:A:$$1$$ hour and $$15$$ minutes  B:$$1.15$$ hours  C:$$7$$ hours and $$5$$ minutes  D:$$7.5$$ hours  E:$$7$$ hours and $$50$$ minutes  请回答其中一个选项.