A fish F is still under water at a depth d = 8 m. A bird is diving along line PQ at a constant velocity in air. When the bird is exactly above the fish
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A fish F is still under water at a depth d = 8 m. A bird is diving along line PQ at a constant velocity in air. When the bird is exactly above the fish, the fish observes it at a height of 40 m from itself and A fish F is still under water [...]