The displacement of the girl which the relative change in her position from her starting point. Therefore, the shortest distance between her initial and final position is 58.85 m North - West
From the sketch of the girls movement attached below, the displacement of the girl can be calculated thus :
Using Pythagoras :
Displacement, d = √(50² + 20²)
d = √(2500 + 400)
d = √2900
d = 53.851
Therefore, the displacement of the girl, which is the shortest distance between her current position and starting position is 53.85 meters NW.
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Answer:
4.5 hours
Explanation:
Let the time for the bicycle be t, then the time for walking is 7 - t
Distance for walking is 4*(7 - t)
Distance for cycling is 44*t
Total distance 4*(7 - t) + 44t = 208
28 - 4t + 44t = 208
40t = 208 - 28 = 180
so t = 180/40 = 4.5 hours.