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A person is standing on road by holding ...

A person is standing on road by holding an umbrella at right angle to the horizontal surface in order to protect himself from rain falling at a speed of 10 m/s, when the velocity of wind is zero. Suddenly wind begins to flow at a speed of 20m/s, `30^(@)` south of west. Now by what angle the person has to rotate his umbrella in order to protect himself from rain ?

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