1) It took Tom 4 hours to drive from Washington to New York in a single trip of 224 miles.

1) It took Tom 4 hours to drive from Washington to New York in a single trip of 224 miles. Show that there is at least an instant that the Tom's car speed equaled to 224/4=56 miles/hour, the average speed in this trip. (Hint: Imagine that the car speed v(t) is a continuous smooth function of time t.)