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Algebra Difficulty 2.0 Junior Find the answer United Kingdom

John always walks to and from school at the same speed. When he walks to school along the road and walks back using a short cut across the fields, he walks for 50 minutes. When he uses the short cut both ways, he walks for 30 minutes. How long does it take him when he walks along the road both ways?

(A) $60$ minutes (B) $65$ minutes (C) $70$ minutes (D) $75$ minutes (E) $80$ minutes

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