For the curve $y=5x-2x^{3}$,if $x$ increases at the rate of $2 \text{ units/sec}$,then how fast is the slope of the curve changing when $x=3$?

  • A
    -$72$ units/sec
  • B
    $72$ units/sec
  • C
    $36$ units/sec
  • D
    -$36$ units/sec

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