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[" 15.An aeroplane flying horizontally "...

[" 15.An aeroplane flying horizontally "141.4m],[" is observed at an elevation of "60^(@)" and after "10s" the "],[" elevation is observed to be "30^(@)" The uniform speed of "],[" the aeroplane in "km/h" is "],[[" (a) "240," (b) "240sqrt(3)],[" (c) "60sqrt(3)," (b) "240sqrt(3)]]

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