A wheel makes 4000 revolution is covering a distance of 60km. The radius of the wheel is:
Distance covered in 1 revolution $$=Â \frac{60\times1000}{4000} = 12.5 m $$
According to the question,
$$2\times \pi \times r = 15$$
$$\Rightarrow r = 2.39$$
Option D is correct
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