After shopping, Leni decided to go home and she travelled 3 km east to fetch her sister. Then, she proceeded to another 900 meters to reach their house. What is the total distance and displacement of Leni in km? What is the total distance and displacement of her sister in km? (Please show the solution)
Based on the data of the problem the total distance = displacement = "3+0.9=3.9\\ (km)"
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