A student drove to the university from her home and noted that the odometer reading of her car increased by 15.0 km. The trip took 20.0 min. (For each answer, enter a number.) (a) What was her average speed in km/h? km/h (b) If the straight-line distance from her home to the university is 10.3 km in a direction 25.0 south of east, what was her average velocity in km/h? km/h (c) If she returned home by the same path 7 h 30 min after she left, what were her average speed and velocity in km/h for the entire trip? average speed km/ h average velocity km/ h