Graph is below. calculate the total distance travelled by the car during the 120 seconds. i just need the starting equation
you

Given the graph of the speed, the distance is the area under the curve with the x axis as the minimum
so from t=0, to t=20, the area is 280
from t=20 to t=90 is area of 700
area from t=90 to t=120 is 450
total them areas up
280+700+450=1430

the distance is 1430 meters