sir this is the important question from the book -ML aggarwal( avichal publication) class 10th , chapter20 , heights and distances
A man observes the angles of elevation of the top of a building to be 300.
He walks towards it in a horizontal line through its base.
On covering 60 m the angle of elevation changes to 600.
Find the height of the building correct to the nearest decimal place.
question no 20 , heights and distances , ICSE board