Running for his life, Riley travels 100m in 9.83s. What was his average velocity in
"m/s" and "km/h"?

100m / 9.83 sec = 10.17 m/s  (rounded)There are 3,600 seconds in an hour.(100 m / 9.83 sec) x ( 3600 sec/hr) = 36,622.6 m/hr = 36.62 km/hrThat's about 22.8 miles per hour.