Hey guys .
A quick question .
A police car joins a straight motorway at junction 4 and travels for 12km at a constant speed for 400s and then leaves at junction 5 and rejoins the opposite direction and travel for 8km at a constant speed for 320 s to reach the scene of an accident .
i've calculated the displacement of the car which is 4 but have no clue how to draw a displacement-time graph for it, any help would be much appreciated .