5. How long would it take 6 friends to wash all the windows?

It takes 3 friends 28 minutes to wash all the windows in Blair's apartment. How long would it take 6 friends, working at the same rate, to wash all the windows?
(A) 6 minutes
(B) 14 minutes
(C) 22 minutes
(D) 10 minutes
(E) 8 minutes