A man running on the horizontal road at \( 8 \mathrm{~km} \mathrm{~h}^{-1} \) finds the rain app...

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A man running on the horizontal road at \( 8 \mathrm{~km} \mathrm{~h}^{-1} \) finds the rain appears to be falling vertically. He increases his speed to \( 12 \mathrm{~km} \mathrm{~h}^{-1} \) and finds that the drops make an angle \( 30^{\circ} \) with the vertical. The speed of the rain with respect to road is
(A) \( 10 \mathrm{~km} / \mathrm{h} \)
(B) \( 9.5 \mathrm{~km} / \mathrm{h} \)
(C) \( 10.58 \mathrm{~km} / \mathrm{h} \)
(D) \( 6 \mathrm{~km} / \mathrm{h} \)
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