The graph shows the total distance, in miles, Keandra traveled from her home over a certain amount of time, in minutes.

graph with the x axis labeled time in minutes and the y axis labeled total distance in miles, with a line segment from 0, 0 to 40, 50. a horizontal line segment from 40, 50 to 60, 50, a line segment from 60, 50 to 80, 100 and a line segment from 80, 100 to 120, 50

Part A: Identify the interval(s) where the graph is increasing, decreasing, and constant. (2 points)

Part B: Write a detailed description for the graph using information from Part A. (2 points)