A) 25 m
B) 50 m
C) 75 m
D) 100 m
E) 39 m
Correct Answer: B
Solution :
Area of region covered \[=\pi (2nR)\] In\[1\text{ }k{{m}^{2}}=1000\] people \[\frac{1}{1000}\times 20\times {{10}^{6}}=20\times {{10}^{6}}=A\] \[\therefore \] \[20\times {{10}^{3}}=\pi (2\times h\times 6400)\] \[\Rightarrow \] \[h=\frac{20\times {{10}^{3}}}{\pi \times 2\times 6400}\approx 50m\]
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