To determine Larry's average speed during the specified times, we need to know the distance he ran during those time intervals. Average speed is calculated using the formula:
\[ \text{Average Speed} = \frac{\text{Total Distance}}{\text{Total Time}} \]
If you provide the distance he ran from hour 2 to hour 4 and the distance from hour 4 to hour 7, I can help you calculate the average speeds and compare them to see if he sped up, slowed down, or stayed the same.