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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Lewis drives from London to Brighton at an average speed of 60 mph. On the way back, he gets stuck in traffic and his average speed is only 40 mph. What is his average speed for the whole journey?

(A) $55$ mph (B) $50$ mph (C) $48$ mph (D) $45$ mph (E) Impossible to determine

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