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