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At $8am$ particle $A$ is at point $(0,0)$ and moves horizontally to the right with constant velocity of $60km/h$. At the same time particle $B$ is at the point $(0, A+B+C+5)$ and moves horizontally to the left with a velocity of $30km/h$. what are the rates of change of the distance between the two particles at $8.00am, 9.00am$? and in general time $t$?

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    $A$ and $B$ are names of particles, but then you add them as if they are numbers. What does that mean? And what's $C$?2012-11-11

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