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A woman is jogging at a constant rate of 10km/h

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A woman is jogging at a constant rate of 10km/h, she crosses a point P heading north.  Ten minutes later a man riding his bicycle at a constant rate of 36km/h crosses the same point heading east. How fast is the distance between them changing 20 minutes after the man crosses?
asked Nov 14, 2013 in Calculus by anonymous
   

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