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Interpreting graphs of functions

Problem

Today, Sean left home at 8 a.m., drove to work, and worked from 9 a.m. until 5 p.m. On the drive back home, Sean got stuck in slow-moving traffic for 2 hours, then stopped to have dinner, and finally got home at 9:30 p.m.
The graph below shows Sean's distance, d, from his home (in kilometers) as a function of the time, t (in hours).
Complete the sentences below based on the graph of the function.
  • Sean's workplace is located
    • Your answer should be
    • an integer, like 6
    • an exact decimal, like 0.75
    • a proper fraction, like 1/2 or 6/10
    • an improper fraction, like 10/7 or 14/8
    • a mixed number, like 1 3/4
     km from his home.
  • Sean's speed when he was driving to work was
    • Your answer should be
    • an integer, like 6
    • an exact decimal, like 0.75
    • a proper fraction, like 1/2 or 6/10
    • an improper fraction, like 10/7 or 14/8
    • a mixed number, like 1 3/4
     km/h.
  • Sean's speed between 5 p.m. and 7 p.m. was
    • Your answer should be
    • an integer, like 6
    • an exact decimal, like 0.75
    • a proper fraction, like 1/2 or 6/10
    • an improper fraction, like 10/7 or 14/8
    • a mixed number, like 1 3/4
     km/h.
An XY coordinate plane a line plotted. The horizontal x axis represents the time, in hours, and runs from 0 to 25 in intervals of 1. The vertical y axis represents the distance, in kilometers, and runs from 0 to 25 in intervals of 1. The line runs horizontal from (0, 0) until (8,0), then increases until (9, 20), then plateaus until (17, 20), then decreases until (19, 10), then plateaus until (21, 10), decreases again until (21.5, 0), and then plateaus until (24, 0). The line passes through the points (0, 0), (8, 0), (9, 20), (17, 20), (4, 20), (18, 15), (19, 10), (20, 10), and (21, 10).
Stuck?
Stuck?