# You run a 100-yd dash in 9.8 seconds. What is your speed in miles per hour?

##### 1 Answer

Nov 13, 2015

#### Answer:

20.90 mph

#### Explanation:

This is a problem that is employing conversion and conversion factors.

we'er given a yards per second speed, so need to convert yards to miles and seconds into hours.

then we convert the seconds into hours

Now that you have the right units, you can use the speed equation

It's important to note that when I did this calculations I did not round. Therefore, if you were to calculate