If a race car completes a 4mi oval track in 73.2s, what is the average speed in units of mi/h?

To find average speed, we need to divide the total distance traveled by the time it took to cover that distance. In this case, the race car completed a 4-mile oval track in 73.2 seconds.

To calculate the average speed in miles per hour (mi/h), we'll follow these steps:

Step 1: Convert the time from seconds to hours.
Since there are 60 seconds in a minute and 60 minutes in an hour, we divide the time in seconds by 60×60 to convert it to hours:
73.2 seconds ÷ (60 × 60) hours = 0.020333 hours.

Step 2: Divide the distance by the time.
We divide the distance of 4 miles by the time of 0.020333 hours:
4 miles ÷ 0.020333 hours = 196.688679 mi/h

Therefore, the average speed of the race car is approximately 196.69 mi/h.