Question: How many times longer than an Association football pitch is the stadium in Prague at which the Spartakiads took place?
Sentence (from "Spartakiad (Czechoslovakia)"): The Spartakiads or Spartakiades in Czechoslovakia (Czech: "Spartakiáda" , Slovak: "Spartakiáda" ) were mass gymnastics events, designed to celebrate the Red Army's liberation of Czechoslovakia in 1945.
Relevant evidence: No