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

https://www.teachoo.com/1813/535/Ex-9.1--13---As-observed-from-top-of-a-75-m-high-lighthouse/category/Ex-9.1/

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

 

  1. Class 10
  2. Solutions of Sample Papers for Class 10 Boards

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.