On May 26, 1934, a streamlined, stainless steel diesel train called the Zephyr set the world's nonstop, the long-distance speed record for trains. Its run from Denver to Chicago took 13 hours, 4 minutes, and 58 seconds and was witnessed by more than a million people along the route. The total distance traveled was 1633.8 km. What was its average speed in m/s?