On her way to school, a child discovered that her coin is missing and there is a hole in her pocket. She turned back and walked 24m east along the sidewalk. Then, she stopped for 18s and decided to head back to school. After walking 11m west, she found the coin. If the child walked back at a speed of 0.25m/d, calculate a) her average velocity while searching for the coin b) her average speed while searching for the coin.