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She obtained the average speed of the three measurements.
48 metres per second.
The idea is to divide the distance by the time.
The answer will depend on whether you want the average speed during the 3 metre drop or the instantaneous speed when it has fallen 3 m.
Average speed is an average value of speed over a given time. If your speed is constant (not changing), then your average speed will equal your speed at any given moment in time.