Question

If the driving wheel of a bicycle makes $560$ revolutions in travelling $1.1km$, what is its radius?

• A. $31.25cm$
• B. $27.25cm$
• C. $13.25cm$
• D. $25.25cm$

Answer 1

Answer: (A)

$31.25cm$

Let 'n' be no of rev. then (r is rod)

$n\times \left(2\pi r\right)=1100m\Rightarrow r=\frac{1100\times 7}{2\times 22\times 560}$

$\Rightarrow r=0.3125m=31.25cm$