What is the average speed, in miles per hour, when doing the 100 meter dash in 10.1 seconds?

To do a 100 meter dash in 10.1 seconds, you're running at about 10 m/s. To convert m/s to mph, you have to do two conversions -- meters to miles and seconds to hours. It will help to write your velocity in m/s as 10 m/1 s, or 10 meters in 1 second. Beginning with the conversion of seconds to hours, there are 3600 seconds in an hour. Since you have 1 second here, you can divide 1 by 3600 to get about 0.00028 hours. To change 10 meters to miles, you divide 10 by 1609.344 to get about 0.0062 miles. Now, you have 0.0062 mi/ 0.00028 h. Divide the numbers out to get about 22.143 mph. If you check this using Google's conversion tool, you'll see that the actual number is 22.3694 mph. This is just because of rounding error, as the actual values carry out to many more decimal places.