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A ladder 60 ft long rests against a vert...

A ladder `60` ft long rests against a vertical wall on a level plane. Its foot is slipping away from the wall . If when the foot is x.ft . From the wall the top and the foot are moving at the same rate , then :x=

A

30

B

`20sqrt2`

C

35

D

`30sqrt2`

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The correct Answer is:
D
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MARVEL PUBLICATION-APLICATIONS OF DERIVATIVES-MULTIPLE CHOICE QUESTIONS (TEST YOUR GRASP - II : CHAPTER 12)
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