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A girl looks the reflection of the top of the lamp post on the mirror which is 6.6 \ m away from the foot of the lamppost. The girl whose height is 1.25 \ m is standing 2.5\ m away from the mirror. Assuming the mirror is placed on the ground facing the sky and the girl, mirror and the lamppost are in a same line, find the height of the lamp post.
 
The height of the lamp post =  m