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A ladder 20 ft long leans against a vert...

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 and 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 Answer is:
A
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TARGET PUBLICATION-APPLICATIONS OF DERIVATIVES-COMPETITIVE THINKING
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