For the curve \(y=6x-5x^3\) if \(x\) increases at the rate of 2 unit/sec then how fast slope of curve changing when \(x=3\)

-120 unit/sec -180 unit/sec -100 unit/sec -200 unit/sec

-180 unit/sec

\(\frac{d}{dt}(\frac{dy}{dx})=-30x\frac{dx}{dt}\)