At $8am$ particle $A$ is at point $(0,0)$ and moves horizontally to the right with constant velocity of $60km/h$. At the same time particle $B$ is at the point $(0, A+B+C+5)$ and moves horizontally to the left with a velocity of $30km/h$. what are the rates of change of the distance between the two particles at $8.00am, 9.00am$? and in general time $t$?
let distance between cars be z
at time t the cars are moved a distance of