A man standing on a road holds his umbrella at 30 o with the vertical to keep the rain away. He throws the umbrella and starts running at 15 km/h.

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A man standing on a road holds his umbrella at 30o with the vertical to keep the rain away. He throws the umbrella and starts running at 15 km/h. He finds that now raindrops are hitting his head vertically. Find the speed of raindrops.