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The airplane is 3,300 feet from the ground.
To calculate this, use the tangent of the angle of elevation:
tan(54 degrees) = (distance from Marna to the airplane) / (difference in height between Marna and the airplane)
tan(54) = x / (2400 - 1350)
tan(54) = x / 1050
x = 1050 * tan(54)
x ≈ 3,300
So, the airplane is approximately 3,300 feet from the ground.