Problem: The worlds record in the 100m dash is 9.69s and in the 100 yard dash is 9.21s.Find the speed in mi/h of the runner who set second record (9.21s).

FREE Expert Solution

We have to calculate the speed of the runner in mi/h units who completed a 100 yard dash in 9.21 seconds.


Speed is defined as the distance covered in unit time.

Speed = distance coveredtime


To solve this problem, we need to know the following conversion factors:

1 mi = 1763 yd

80% (440 ratings)
View Complete Written Solution
Problem Details

The worlds record in the 100m dash is 9.69s and in the 100 yard dash is 9.21s.

Find the speed in mi/h of the runner who set second record (9.21s).

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Dimensional Analysis concept. You can view video lessons to learn Dimensional Analysis. Or if you need more Dimensional Analysis practice, you can also practice Dimensional Analysis practice problems.