To calculate the time it takes to drive a certain distance at a specific speed, you can use the formula:
\[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]
In this case, the distance is 225 miles and the speed is 25 miles per hour. Plugging in the values:
\[ \text{Time} = \frac{225 \text{ miles}}{25 \text{ miles per hour}} = 9 \text{ hours} \]
So, it will take you 9 hours to drive 225 miles at a speed of 25 miles per hour.