At 8am particle A is at point (0,0) and moves horizontally to the right with constant velocity of 60km/hr. 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/hr. what are the rates of change of the distance between the two particles at 8.00am, 9.00am? and in general time t?