Hi someone please help with this one

a bicycle track can be modelled by the curve with the equation

y= 2.4x³ + 3.1x² - 2x + 1.5, 0 ≤ x ≤ 5

where x and y are respectively the horizontal and vertical distances (in km) from the origin

(i) find the gradient at the start and end of the track

(i) find when the gradient of the path is zero

THANKS