Tom and Jerry have to mail $$2000$$ envelopes for a new marketing campaign. Jerry can mail $$120$$ envelopes per hour. With Tom\textquotesingle s help, they can get the job done in $$10$$ hours. How long will it take Tom to finish the job by himself? 
选项为:A:$$24$$  B:$$25$$  C:$$30$$  D:$$80$$  请回答其中一个选项.