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a walker and a cyclist leave a highway intersection at the same time in perpendicular directions....

a walker and a cyclist leave a highway intersection at the same time in perpendicular directions. The walker moves at a rate of 3.5 km / hr and the cyclist at 12 km / hr. Both people move away from the intersection. Calculate the rate of change of the distance between these two people when exactly 2 hours have passed from the time they left the intersection.
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