A) 50,000
B) 60,000
C) 10,000
D) 70,000
Correct Answer: A
Solution :
\[2r=77\,cm,\,\,\therefore r=\frac{77}{2}cm\] \[C=2gpr=2\times \frac{22}{7}\times \frac{77}{2}=242cm\] No. of revolution\[\text{=}\frac{\text{distance}}{\text{circumference}}\text{=}\frac{\text{121km}}{\text{242cm}}\] \[=\frac{121\times 1000\times 100}{242}=50,000\]
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