In a race of length D m , A beats B by X m and C by Y m. By what distance does B beat C in the same race?
A: (Y-X)D / (D-Y) m
B: (Y-X)D / (D-X) m
C: (D-Y)D / (D-X) m
D: (D-X)D / (D-Y) m
Answer: B
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