Well distance=rate x time so rate = distance divided by time.
100/20 is 5
5 meters per second
5.1 m/s
Legally Carl Lewis.
A 10.49-second 100-meter dash equates to an average speed of 21.32 miles per hour.
100m/40s or 2.5 metres per second.
A 12.5-second 100m equates to a time of 4.572 seconds in the 40-yard dash.
Usain Bolt took 41 steps to set the new world record of 9.58 seconds
11.99 seconds because 100 yard dash is 91 meters. 100 meters/91 meters = 1.09 Then do 11 seconds x 1.09 = 11.99 seconds. If you round it, you basically be getting a 12 second 100 meter dash.
The men's world record in the 400 meter dash is 43.18 seconds. The men's world record in the 400 meter hurdles is 46.78 seconds. This is a difference of 3.60 seconds. The women's world record in the 400 meter dash is 47.60 seconds. The women's world record in the 400 meter hurdles is 52.34 seconds. This is a difference of 4.74 seconds.
A 12 year old's average time for the 100 meter dash, should be about 15 or 16 seconds.
11.184 681 46 mile/hour (mph) this is the site I used: http://www.onlineconversion.com/speed_common.htm
His 5.0 40-meter dash translates to a time of 4.572 seconds in the 40-yard dash.
45 seconds.
Approximately 8 seconds