Passage: Sohn first competed in the 1,500 and 5,000 m, but turned to longer distances after winning an eight-mile race in October 1933. Between 1933 and 1936, he ran 12 marathons; he finished in the top three on all occasions and won nine. On November 3, 1935 in Tokyo, Japan, Sohn set a world record in the marathon with a time of 2:26:42. According to the International Association of Athletics Federations, this record remained unbroken until Sohn's own trainee, Suh Yun-Bok, won the 1947 Boston Marathon.
How many marathons between 1933 and 1936 did Sohn place outside of the top 3? How many maratons did he finish in the top three? How many miles did he run when he won in October 1933? How many of the 12 marathons did Sohn win? How many years did Sohn's world record stand? How many years did he run marathons before he set the world record? How many years did his record remain unbroken for? How many years did it take Sohn to finish 12 marathons? How many years did it take him to run 12 marathons? How many years spanned from when he ran a total of 12 marathons? Which happened later, Suh Yun-Bok winning the 1947 Boston Marathon or Sohn setting a world record marathon time? Who broke Sohn's marathon world record?