C155 I will Participate in the 100m Tall Flying Man War

"Why is it 40 kilometers, and not 42.195 kilometers?" After a long silence, the history teacher asked curiously.

"Because in the past, Fidipei ran 40 kilometers, the second Olympic marathon was 40.260 kilometers, the third was 40 kilometers, and the fourth Olympic Games were officially determined to be 42.195 kilometers." Qin Luo paused and continued, "So the marathon was the first 40 kilometers