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Distance between two place in which angle change is D = n(cotθ₁ + cotθ₂) Distance = 3000√3 (cot30° + cot60°) = 3000√3 × √3 - 1/√3 = 3000√3 × 2/√3 = 6000 m So, distance covered by plane in 20 sec = 6000 m Speed of plane = 6000/20 = 300 m/sec.