The four places where events take place are the places where the slope changes:
1) The spot where the graph flattens out momentarily
2) The long horizontal section of the graph
3) Where the slope is negative for a short time
4) Where the slope is negative for a long time
moving forward → positive slope
moving backward → negative slope
stopping → __________
If velocity is slope of the distance graph... so speeding would mean steep slope. Be mindful that speeding could mean steep-and-positive or steep-and-negative.
Refer to the hint in part (b).