Julie drives 100 mi to Grandmother's house. On the way to Grandmother's, Julie drives half the distance at 33.0 and half the dis
tance at 80.0 . On her return trip, she drives half the time at 33.0 and half the time at 80.0 . What is Julie's average speed on the way to Grandmother's house? What is her average speed on the return trip?
Average speed is ALWAYS calculated as total distance / total time <span>total distance is 100mi </span> <span>total time is (50mi / 33) + (50mi / 80) </span> <span>total time is = 1.52 + 0.625 = 2.145 </span> <span>so average speed going to grandmothers house is 100mi / 2.145 hrs = 46.62 mph </span>
