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A bird B in air is diving vertically dow...

A bird B in air is diving vertically downwards over a water tank with speed 5 cm/s. Base of the tank is silvered. A fish F in the tank is rising vertically upwards along the same line with speed 2 cm/s. Water level is lowered at the rate of 2 cm/s. Take `mu_("water")=4//3`

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