You drive on Interstate 10 from San Antonio to Houston, half the time at 51 km/h and the other half at 98 km/h. On the way back you travel half the distance at 51 km/h and the other half at 98 km/h.
(a) What is your average speed from Houston back to San Antonio?
(b) What is your average speed for the entire trip?
(c) Describe in words the graph x versus t for (a), assuming the motion is all in the positive x direction.
(d) Describe how the average velocity can be found on a graph of x versus t.