the angle of elevation of the an aeroplane from a point of a ground in 60 degree after the flight is 30 second angle of elevation is become 30 if aeroplane is flying at the constant height 300√3 m find the speed of aeroplane
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tan60 = 300√3/x ⇒x =300
tan30 = 300√3/(300 +y) ⇒ y = 600
the aeroplane travels 600m in 30 secs ⇒ 72km/hr
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