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5. Two roads, one which runs north-south and the other which runs east-west intersect at Eagle...

5. Two roads, one which runs north-south and the other which runs east-west intersect at Eagle Corners in Winslow Arizona. Bertrand is approaching Eagle Corners from the north at 60 km/h and Randy is leaving the Eagle Corners travelling west at 40 km/h. How fast is the distance between them changing at the instant Bertrand is 2.0 km north of Eagle Corners and Randy is 2.1 km west of Eagle Corners?

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