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If the length of track is 50m then the length of 3 laps is 3x50 = 150 meters and this is surely not the objective of giving the question.
If the diameter of the track is 50m then the length covered in one lap of the track is 2*pi*50 = 314 meters where pi = 3.14
3 laps around the track = 3*314 = 942m
Hilary runs 942 meters by making 3 laps around the track.
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