A point $\>P\>$ is moving along the curve whose equation is $\>y = 6 x\>$. How fast is the distance between $\>P\>$ and the point $\> (3, 0) \>$ changing at the instant when $\>P\>$ is at $\> (3, 18) \>$ if $\>x\>$ is decreasing at the rate of $\>3\>$ units/s at that instant?

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