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Two highways are perpendicular to each o...

Two highways are perpendicular to each other imagine them to be along the x-axis and the y-axis, respectively. At the instant t = 0, a police car P is at a distance d = 400 m from the intersection and moving at speed of 8 km//h towards it at a speed of 60 km//h along they y-axis. The minimum distance between the cars is

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