Answer:
The car travels 64 miles per hour.
Explanation:
The problem is asking for the ratio between distance and time, and that it's the definition of speed, so we use:
![v=(d)/(t)](https://img.qammunity.org/2020/formulas/physics/high-school/jidcwnxn1c0zdocnxtzp97sqgn187ivyra.png)
Now, we need to find the ratio in miles and hours, that means we have to transform 15 minutes into hours to know the total time in hours.
We know that 1 hours is 60 minutes, applying this ratio, we have:
![15min(1hr)/(60min)=0.25 hr](https://img.qammunity.org/2020/formulas/mathematics/middle-school/coj2n4tcyzmz9hjl2w2k7az3rfpguhwss8.png)
So, the total time the car travels is 4.25 hours.
Now, we calculate the ratio:
![v=(272 \ miles)/(4.25 hours)=64 \ miles/hr](https://img.qammunity.org/2020/formulas/mathematics/middle-school/1g8m0ohg4nhsqhcnpg3enqwn02u08tvfcj.png)
Therefore, the car travels 64 miles per hour.