Question

A car travels 0.99 km distance in which each wheel makes 450 complete revolutions. Find the radius of its wheel in m.

• A. 0.45
• B. 0.35
• C. 0.55
• D. 0.65

Answer 1

The correct option is B

0.35

We know that, $0.99km=990m$

Total Distance traveled = No. of revolutions x Circumference

$\Rightarrow 990=450\times 2\pi \times r\Rightarrow 990=450\times 2\times \frac{22}{7}\times r\Rightarrow r=\frac{990\times 7}{450\times 2\times 22}\Rightarrow r=\frac{7}{20}=0.35m$