A fish is rising up vertically inside a pond with velocity of \( 4 \mathrm{~cm} / \mathrm{s} \),...

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A fish is rising up vertically inside a pond with velocity of \( 4 \mathrm{~cm} / \mathrm{s} \), and notices a bird, which is diving vertically downward and its velocity appears to be \( 16 \mathrm{~cm} / \mathrm{s} \) (to the fish). What is the real velocity of the diving bird, if refractive index of water is \( 4 / 3 \) ?
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