If a shower of rain appears to be falling vertically downwards with a speed of \( 12 \mathrm{~km...

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If a shower of rain appears to be falling vertically downwards with a speed of \( 12 \mathrm{~km} / \mathrm{h} \) to a person walking due east with a speed of \( 5 \mathrm{~km} / \mathrm{h} \), what is the actual velocity of rain?
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