Sarah and Dave visit Betty
Sarah and Dave set out together to cycle to Betty's house in a neighbouring town. Sarah opts to maintain a constant speed for the entire journey. Dave, however, cycles at twice her speed for the first half of the journey - then half of her speed for the remainder. Ignoring their negligible accelerations and decelerations, which of the following is true: A. Sarah and Dave arrive at the Betty's house simultaneously. B. Sarah gets there before Dave. C. Dave gets there before Sarah.
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