How much time will it take a car travelling at 88 km/hr (55 mi/hr) to travel 500km? show work for credit and include final units.

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas is (0,-12). the y intercept of the second parabola is (0,-24) what is the positive difference between the a values for the two functions that describe the parabolas