4. (Textbook, Section 4.6, qn 51) A train is moving East at 0.8 km/min along a long straight track. A movie camera, 0.5km to the South of the track, is focused on the train. Let the distance from the camera to the front of the train be z km. Let the distance from the nearest point to the camera on the track to the front of the train be 3: km. (a) Draw a well-labeled picture of this situation. (13) How fast is the camera rotating when the train is 1 km from the camera