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

Q. A fish rising vertically up towards the surface of water at a speed of $3m{s}^{-1}$ observes a bird diving vertically downwards towards it at a speed $9m{s}^{-1}$. The real speed of bird will be:
(Given ${\mu }_w=\frac{4}{3}$)

Q. A fish rising vertically with speed 3 m/s to the surface of water sees a bird diving vertically towards it with speed 9 m/s. Given ${}_a{\mu }_w=\left(4/3\right)$. The actual velocity of dive of bird is

Q. In a lake, a fish rising vertically to the surface of water uniformly at the rate of $3m/s$, observes a bird diving vertically towards the water at a rate of $9m/s$ vertically above it. the actual velocity of the dive of the bird is : (Given refractive index water $=4/3$)

Q. A fish is rising up vertically inside a pond with a velocity of 4 cm/sec and notices a bird that is diving vertically downwards towards the pond and its velocity appears to be 20 cm/sec to the fish. What is the real velocity of the diving bird, if the refractive index of water is $\frac{4}{3}$?

Q. A bird is flying $3m$ above the surface of water. If the bird is diving vertically down with speed of $6m/s$, its apparent velocity as seen by a stationary fish underwater is :
$({\mu }_{water}=\frac{4}{3})$