A) 168 m
B) 169 m
C) 144 m
D) 108 m
Correct Answer: A
Solution :
Inner circumference \[=2\,\,\pi \,\,r=440\,\,\text{m}\] \[\Rightarrow \]\[r=\frac{440}{2\times 22}\times 7=70\,\,\text{m}\] Width of track = 14 m \[\therefore \] Radius of outer circle \[=(70+14)\text{m}=84\,\,\text{m}\] \[\therefore \] Diameter of outer circle \[=2\times 84=168\,\,\text{m}\]You need to login to perform this action.
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