A day's painting

This task is about reading information off a graph.
Hohepa spent a day in his holidays painting a concrete wall for his father.
He started preparing at 9 a.m., and finished painting for the day at 5 p.m.
The following graph shows his progress. 

Question 1Change answer

Area of wall painted over the day
 
graph-painting-day.png
Write a description of what happened over the day:
  • pay particular attention to the slopes of the various parts of the graph line,
  • estimate the times when these change, and
  • write what you think Hohepa is doing at each stage.