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Algebra Difficulty 1.0 Junior Find the answer United Kingdom

Kush spent five days walking in the mountains. He started on Monday and his last day was Friday. Each day he walked 2 km more than he had done the day before. The total distance he walked was 70 km. What distance did Kush walk on Thursday?

(A) $12$ km (B) $13$ km (C) $14$ km (D) $15$ km (E) $16$ km

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