Can't you say hosszú fekete autók erkeznek a bankokhoz?
Yes, that word order is fine. Be careful about accents: it's érkeznek, although Duo will probably just give you a warning for using e at the beginning instead.
hosszú fekete autók érkeznek a bankokhoz pontosan ugyanazt jelenti
Hosszú fekete autók a bankokhoz érkeznek isn't accepted either. Is it wrong indeed?