A) \[20\,m\]
B) \[21\,m\]
C) \[22\,m\]
D) \[24\,m\]
Correct Answer: B
Solution :
| [b] Let \[{{R}_{1}}\,m\] and \[{{R}_{2}}\,m\] be the radii of the outer and inner circular path. |
| \[\therefore \,\,\,\,\,\,\,\,\,2\pi {{R}_{1}}-2\pi {{R}_{2}}=132\,\,\Rightarrow \,\,{{R}_{1}}-{{R}_{2}}=\frac{132}{2\pi }\] |
| \[\Rightarrow \,\,\,\,\,\,{{R}_{1}}-{{R}_{2}}=\frac{132\times 7}{2\times 22}=21\] |
| Hence, the. width of the path is\[\text{21 m}\]. |
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