After walking for 6.0 min on the way to school, a child discovers that her loonie is missing and there is a hole in her pocket. She immediately turns back and slowly walks 40 m, on the sidewalk, where she finds the coin. After stopping for 45 s the child heads back to school and arrives in later. If the school is located 500 m east of home (see Figure A1.03), and the child walks at a speed of 0.25 m/s while searching for the coin, determine a. her average velocity during the whole trip? b. her average speed during the whole trip? c. her normal walking speed?