ANSWERS: 2
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F. Old lady driving
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distance = rate x time so, time = distance / rate and rate = distance / time let D equal distance from A to B time going equals D / 20 time returning equals D / 30 total time is (D / 20) + (D / 30) or D / 12 total distance is 2D (there and back) so, average speed is 2D / (D / 12) or 24 answer B.
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