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### Question Asked by a Student from EXXAMM.com Team

** Q 3040534413. ** An aeroplane is flying horizontally at a height of `3150\ m` above a horizontal plane ground. At a particular instant, it passes another plane vertically below it. At this instant, the angles of elevation of the planes from a point on the ground are `30^{\circ}` and `60^{\circ}`. Hence, the distance between the two planes at that instant is: