One day Rahul decided to measure the height of the building in his locality. He is 5 feet tall. He places a mirror on the ground and moves until he can see the top of the building. At the instant when Rahul is 2 feet from the mirror, the building is 48 feet from the mirror.

Find
1. The Height of the building. (A.120, B.96, C.40, D.180)

Asked by bassichtmlpage | 26th Mar, 2021, 10:18: AM

Expert Answer:

Let h be the height of the building.
Clearly, the two triangles formed are similar.
So, the sides will be proportional.
Therefore, 
48/2 = h/5
i.e. h = 24 x 5 = 120 m

Answered by Renu Varma | 26th Mar, 2021, 10:33: AM