A) 10.5 metres
B) 7 metres
C) 5.25 metres
D) 21 metres
Correct Answer: A
Solution :
Breadth of road\[={{r}_{2}}-{{r}_{1}}\] \[\therefore \,\,2\pi {{r}_{2}}-2\pi {{r}_{1}}=66\] \[\Rightarrow \,\,2\pi ({{r}_{2}}-{{r}_{1}})=66\] \[\Rightarrow \,\,{{r}_{2}}-{{r}_{1}}=\frac{66}{2\pi }=\frac{66\times 7}{2\times 22}=10.5\,meter\]You need to login to perform this action.
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