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As observed from the top of a 75 m high light house above the sea level, the angles of depression of two ships are 30° and 45°
respectively. If one ship is exactly behind the other on the same side of the light house and in the same straight line, find the distance between the two ships. (use √3  = 1.732)


This question is exactly same as Ex 9.1, 13 of Chapter 9 Class 10 in the NCERT Book.

Please check the answer and video here

In the link above, the answer is

  Distance = 75 (√3  – 1)

Putting √3  = 1.732

  Distance = 75 (1.732 – 1)

  Distance = 75  × 0.732

  Distance = 54.9 m


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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 12 years. He provides courses for Maths and Science at Teachoo.