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Circumference of Circle

The radius of...

Question

The radius of the wheel is 49 cm. Find the number of revolutions that the wheel makes to cover a distance of 6160 cm.

A

5

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B

10

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C

20

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D

40

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Solution

The correct option is C 20
Circumference of circle = 2 $\times π \times$ r
= 2 $\times$ $\frac{22}{7}$ $\times$ 49 = 308
No. of revolutions = $\frac{D i s t a n c e}{C i r c u m f e r e n c e}$
= $\frac{6160}{308}$ = 20

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