1. You have that:
-The police car accelerates 60 meters per second.
- The minivan has a speed of 45 meters per second and is 600 meters ahead of the police car at the beginning of the chase.
2. Therefore, you have:
V1xt=V2xt-600
V1 is the speed of the minivan and V2 is the speed of the police car
3. The time is:
t=-600/V1-V2
t=-600/(45-60)
t=40 seconds