A girl draw to a hospital from her home and noted the odometer reading of her car increased by 12 km the trip took 18 min
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Explanation:
a) Distance travelled by the girl = 12 km
time taken = 18 minutes
18 minutes = 18/60 hours = 0.3 hours
average speed = distance travelled/time taken= 12km/0.3 hr = 40km/h
b) If she returned home by the same path 7 h 30 min after she left,
total time taken = 7hour and 30 min = 7.5h
total distance travelled = 12+12 = 24 km
average speed = 25km/7.5 h = 3.5 km/h
total displacement = 0 (as starting point and end points are same)
average velocity = total displacement/time = 0
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