Who won three long distance races including the marathon at the Olympic Games held at Helsinki in 1952?

Question

The distance of the first modern Olympic Marathon in 1896 was 40 km (24 miles 85 yards), so why, at the 1908 London Olympic Games, was it run over its now-standard distance of 42.195 km (26 miles 385 yards)?

Answer 1

The ans is -
Emil Zátopek