A man running on a horizontal road at 8 km/hr, findsthe rain falling vertically. He increases his speed to12 km/hr and finds that the drops make angle 30^° with the vertical. Speed of rain with respect to road Is(1) 4\sqrt3 km/hr(2) 4 km/hr(3) 4\sqrt7 km/hr(3) 4\sqrt{13} km/hr

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