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A ladder is resting against a vertical wall and its bottom is 2.5 m away from the wall. If it slips 0.8 m down the wall, then its bottom will move away from the wall by 1.4 m. What is the length of the ladder?

6.2 m
6.5 m
6.8 m
7.5 m

Correct Answer: 6.5 m

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