Question

A bicycle wheel makes $5000$ revolutions in moving $11km$. Find diameter of the wheel.

• A. $110cm$
• B. $60cm$
• C. $220cm$
• D. $70cm$

Answer 1

Answer: (D)

$70cm$

Distane travelled in One revolution $=2\pi r$

Distance travelled in $5000$ revolution $=5000\times 2\pi r$

$\Rightarrow 11Km=11\times 1000\times 100m=5000\times 2\pi r$

$\therefore$ $r=35cm$

Diameter $=2r=70cm$.

Hence option ${}^{\prime }{D}^{\prime }$ is the answer.