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 has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.