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Three runners start running simultaneously from different points on a track of length 672 m. A starts from the start line giving B a headstart of 12 m and C a headstart of 24 m. After running for some time, they are at the same point. When A covers 224 m, C is 20 m behind B. How far behind A is C, when A reaches the finish line?
a) 84 mb) 120 mc) 168 md) 192 m
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