You drive from Atlanta, Georgia (which is on Eastern Time) to Birmingham, Alabama (which is on Central Time, one hour behind Eastern Time). You have two time measuring devices with you. The car's clock and a stop watch. At the beginning of your trip, you set the stop watch. When you cross the state line, you re-set your car's clock from Eastern to Central time. At the end of your trip, the stop watch says that the trip took 2.5 hours. How long did the trip take, according to your car's clock? [Select] Is it possible to say, with confidence, which time measuring device (car clock or stop watch) accurately reports the elapsed time (delta t) of the trip? [Select] If so, which one? [Select]