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A girl standing on road holds her umbrella at 45° with the vertical to keep the rain away. If she starts running without umbrella with a speed of 2 15 kmh –1 , the rain drops hit her head vertically. The speed of rain drops with respect to the moving girl is

1. 1 – kmh 30
2. 1 kmh 2 25 −
3. 1 kmh 2 30 −
4. 1 kmh 25 −

Correct answer: 1 kmh 2 30 −

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