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

0.45

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0.35

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0.55

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0.65

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Solution

The correct option is B
0.35

Total Distance traveled = No. of revolutions x Circumference

$\Rightarrow 0.99 = 450 \times 2 π \times r \Rightarrow 990 = 450 \times 2 \times \frac{22}{7} \times r \Rightarrow r = \frac{990 \times 7}{450 \times 2} \Rightarrow r = \frac{7}{20} = 0.35 m$

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