Working together: $$400\div4=100$$ people every week  Gloria: $$100-60=40$$ people every week  $$400\div40=10$$ weeks  $\textasciitilde$ 
Ellie and Gloria have to interview a total of $$400$$ people. Ellie can interview $$60$$ people every week. If Gloria and Ellie work together, they can finish all the work in $$4$$ weeks. How many weeks will it take to finish interviewing everyone by Gloria herself? 
Options:
(A) $$8$$ 
(B) $$10$$ 
(C) $$12$$ 
(D) $$14$$ 
(E) $$16$$ 