A ladder is resting with the wall at an angle of \( 30^{\circ} \). ...

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A ladder is resting with the wall at an angle of \( 30^{\circ} \).
\( \mathrm{P} \) A man is ascending the ladder at the rate of \( 3 \mathrm{ft} / \mathrm{sec} \).

W. His rate of approaching the wall is
(A) \( 3 \mathrm{ft} / \mathrm{sec} \)
(B) \( \frac{3}{2} \mathrm{ft} / \mathrm{sec} \)
(C) \( \frac{3}{4} \mathrm{ft} / \mathrm{sec} \)
(D) \( \frac{3}{\sqrt{2}} \mathrm{ft} / \mathrm{sec} \)
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