A fish rising up vertically toward the surface of water with speed $3 m s^{- 1}$ observes a bird diving down vertically towards it with speed $9 m s^{- 1}$ . The actual velocity of bird is :

$4.5 m s^{- 1}$
$5.4 m s^{- 1}$
$3.0 m s^{- 1}$
$3.4 m s^{- 1}$

5.4 m s^{- 1}

4.5 m s^{- 1}

3.0 m s^{- 1}

3.4 m s^{- 1}

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