how did i get 20

Figure 1) In this problem you will determine the average velocity of a moving object from the graph of its position (t) as a function of time t. A V Part B traveling object might move at different speeds and in different directions during an interval of time, but if we ask at what constant velocity the object would have to travel to achieve the same displacement over the given time interval, that is what we call the Find the average velocity over the time interval from 1 to 3 seconds. object's average velocity. We will use the notation Vave t1, t2] to Express your answer in meters per second to the nearest integer. indicate average velocity over the time interval from t1 to t2. For nstance, Vave [1, 3] is the average velocity over the time interval from View Available Hint(s) = 1 to t = 3. Wave [1, 3] = 20 m/s gure