(a) Isabel is delivering a pizza to Mark's house. She drives at a constant speed toward the house until she hits a traffic jam and has to stop for several minutes. After, she starts up again and drives at a faster speed than before. Distance Distance Distance Distance to to to to Mark's Mark's Mark's Mark's house house house house Time Time Time Time (b) Reuben is driving at a constant speed. He then slows down to pass an accident. After passing it, he goes back to his original speed and continues driving at that speed. Speed Speed Speed Speed Time Time Time Time

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