Ana and Bia walk along a circular track with constant velocities, starting from the same point, at the same moment, but in opposite directions. The first encounter between them is 48 meters to the left and the second encounter 20 meters to the right of the start. What is the total length of the track?
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From the perspective of the person walking to the left, they will have walked to the left a total of 2 × 4 8 = 9 6 meters at the time of the second encounter, at which point they would need to walk another 2 0 meters to return to the starting point. Thus the total length of the track is 9 6 + 2 0 = 1 1 6 meters.