Difficulty: Medium
Average Score: 50%

Last year, Beth's home was d km due north of Ann's home and Carol's home was d km due south of Ann's home. Before Beth and Carol moved, the total distance was 100 kilometers for a trip that began at Ann's home, proceeded in a straight line to Beth's home, then to Carol's home, and then to Ann's home. (1) Before Beth and Carol moved, the total distance was 100 kilometers. (2) After Beth and Carol moved, the straight-line distance between Beth's home and Carol's home decreased by 90%.

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