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Two runners A and B are running round a stadium

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Two runners A and B are running round a stadium. A runs faster than B and it takes 3 minutes to A for one lap. A and B started together, and 8 minutes later A caught B for the first time. How long does it take for B to run one lap? A) 6 min B) 8 min C) 4 min 30 s D) 4 min 48 s E) 4 min 20 s