Question

if a sprinter runs a distance of 100meter in 9.835 calculate his average speed in km/h

Answer 1

here you didn't mention unit of time
let unit of time is second

then, average speed = total distance/total time taken

= 100/9.835 m/s

now in Km/h = 100/9.835 ×( 18/5 )=3.66 km/h