Kayden is a stunt driver. One time, during a gig where she escaped from a building about to explodel!), she drove at a constant speed to get to the safe zone that was 160 meters away. After 3 seconds of driving, she was 85 meters away from the safe zone. Let D(t) denote the distance to the safe zone D measured in meters) as a function of time t (measured in seconds). Write the function's formula.