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The radius of a wheel is $0.25 m$ . What is the number of revolutions it will make to travel a distance of $11 km$ ?

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8000

6000

7000

5000

answer is C.

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Detailed Solution

Given that the radius of a wheel is

0.25 m

and the distance is 11 km.
We have the following formula,
Circumference of circle

= 2 π r

The circumference of the wheel will be,

= 2 × 227 × 0.25 m = 2 × 227 × 25100 = 117 m

Number of revolutions will be,

11 k m 117 m = 11000 m 11 m × 7 = 7000

1km=1000m
Thus, the number of revolutions is

7000

.
Therefore the correct option is 3.

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