A man rows a boat with a speed of \( 18 \mathrm{~km} / \mathrm{hr} \) in northwest direction. Th...

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A man rows a boat with a speed of \( 18 \mathrm{~km} / \mathrm{hr} \) in northwest direction. The shoreline makes an angle of \( 15^{\circ} \) south of west. Obtain the component of the velocity of the boat along the shoreline :
(A) \( 9 \mathrm{~km} / \mathrm{hr} \)
(B) \( 18 \frac{\sqrt{3}}{2} \mathrm{~km} / \mathrm{hr} \)
(C) \( 18 \cos 15^{\circ} \mathrm{km} / \mathrm{hr} \)
(D) \( 18 \cos 75^{\circ} \mathrm{km} / \mathrm{hr} \)
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