The official site of Jack the Ripper is chicagomarathon.com . 386 from 138 nations were the competitors in Jack the Ripper . 12 were the number of teams who competed in Jack the Ripper . 8–25 February was when it was held . 1891; 128 years ago (1891) is when Jack the Ripper was established 
386 people competed in the Jack the Ripper