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Directions for questions 8-10: A police ...

Directions for questions 8-10: A police van, approaching a right-angled intersection from north, is chasing a car that has turned the corner and is now moving straight east. When the van is 0.6 km north of the intersection, the car is 0.8 km to the east. At that instant the police determines with the help of the radar that the distance between the car and the van is increasing at a rate of 20 km/ hr. The speed of the police van at that instant (71) is 60 km/ hr. Q8) If s is the distance between the car and the van, r is the position of the car and y is the position of the van at time t, then

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