5. Bear Big and Bear Small jog on a circular track that is 1500 meters long every day.
On the first day, both start from the starting point at the same time and run the entire way. When Bear Big completes 4 laps and returns to the starting point, Bear Small has completed 3 laps and an additional 300 meters.
On the second day, Bear Big runs the entire way, while Bear Small alternates between running and walking, with the running speed being twice the walking speed. Both start from the starting point at the same time, and when Bear Big completes 3 laps and returns to the starting point, Bear Small also returns to the starting point.
So, the distance Bear Small walked on the second day is $\qquad$ meters.
$600$