To find the distance around the track (d), we can use the relationship between distance, speed, and time. The equation relating these quantities is:
\[ d = \text{speed} \times \text{time} \]
If we consider a speed of 4 km/h and a time of 9.6 hours, the equation can be filled in as follows:
\[ d = 4 , \text{(km/h)} \times 9.6 , \text{(h)} \]
So the appropriate equation to find the distance \( d \) around the track is:
\[ d = 4 \times 9.6 \]
You can compute \( d \) to find the total distance.