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Rain is falling vertically with a speed ...

Rain is falling vertically with a speed of `20ms^(-1)`., A person is running in the rain with a velocity of `5 ms^(-1)` and a wind is also blowing with a speed of `15 ms^(-1)` (both from the west) The angle with the vertical at which the person should hold his umbrella so that he may not get drenched is:

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The correct Answer is:
`tan^(-1) (1//2)`
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