First divide distance / time, to get speed. Since the speed is in meters/second, you have to multiply by 3.6 to convert to km/hour.
900 meters/30 seconds = 30 meters/second
both are just as fast although the one going 10 meters in five seconds is probably accelerating faster...
100 meters/9 seconds = 40 kilometers per hour = 24.85 miles per hour (rounded)
20 meters per second
1000 meters in 60.6 seconds = 36.91 mph
The idea is to divide the distance by the time.
If you traveled 100 meters in 30 seconds, then you would be traveling at 3.333... meters per second, or 200 meters per minute, or 12 kilometers per hour (7.45 miles/hour).
100 meters/15.2 seconds 100 meters = 0.0621371192 miles 15.2 seconds = 0.00422222222 hours 100 m/15.2s = 14.7166861 mph average
6 seconds
0.57 seconds
98.63mph
2.5 seconds