Shelina is driving home from the grocery store. She first drives 10.0 km [E 38° S], then turns and drives 5.0 km [W 25° S], and then finally turns again and drives another 8.5 km [W] to arrive at home. a. Calculate Shelina's total displacement for the whole trip. Make sure to sketch a labelled diagram of her trip (But the diagram does not have to be drawn to scale). Clearly indicate positive and negative directions. [A 6, C 2] . If the entire trip took 24 minutes, then calculate her average speed, in m/s. [A 2]