A sports car at point A drives down a straight stretch of road CD. A police car at point B uses radar to measure the speed of the car, and obtains a reading of 51 km/h. For the position of the car given below, determine the speed of the car. Note that the 51 km/h speed measured by the radar gun is the rate of change of the distance between the car and the radar gun. The car is 30% of the distance from point C to point D. B(75,600,40)m C(-150,-50,30)m D(200,400,-10)m Actual speed of the car: km/h