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:

A

`1050\ m`

B

`2100\ m`

C

`4200\ m`

D

`5250\ m`

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