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A ladder 20 ft long leans against a vertical wall. The top end slides downwards at the rate of 2 ft per second.

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A ladder 20 ft long leans against a vertical wall. The top end slides downwards at the rate of 2 ft per second. The rate at which the lower end moves on a horizontal floor when it is 12 ft from the wall is

(A) 8/3

(B) 6/5

(C) 3/2

(D) 17/4

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The correct option (A) 8/3  

Explanation:

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