The upper (3/4)^(th) portion of a vertic...

The upper `(3/4)^(th)` portion of a vertical pole subtends an angle `"tan"^(-1)3/5` at a point in the horizontal plane through its foot at a distance 40 m from the foot . A possible height of the vertical pole is

40 m

60 m

80 m

20 m

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