Afloodlight at ground level is illuminating a building that is 100m away. a man 1.8m tall is walking from the floodlight to the building along a path that is perpendicular to the building. if he is walking at the rate of 1m/s, at what rate is his shadow on the building decreasing when he is 60 m from the building expert answer

0.1125 m/s

Explanation:

Given

Height of Person is 1.8 m

walking rate towards building is 1 m/s

From Similar triangle concept

y=4.5 m

Now suppose at any distance x between man and building

Differentiate w.r.t to time

and

and at x=60 y=4.5 m

i think it's 35 meters

the answer would most likely be c, because if it's a comical piece of information, it may likely not be true, if it's a site that allows anybody to edit the content, it could mean a five year old is typing the info, and if it's a tv show produced by a celeb, it may have a biased opinion.