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Railways PYQCBT 1 2020

RRB NTPC · Question 68

The horizontal distance between two towers is 40√3 m. The angle of depression of the top of the first tower when seen from the top of the second tower is 30°. If the height of the second tower is 130 m, find the height of the first tower.

  1. 80 m

  2. 90 m

  3. 85 m

  4. 95 m

Show answer & explanation

Answer: (B) 90 m

Explanation

The height difference = 40√3 × tan 30° = 40√3 × 1/√3 = 40 m. The first tower is 130 − 40 = 90 m high.