Question 57

A track is in the form of a ring whose inner circumference is 352 m and the outer circumference is 396 m. The width of the track is

Solution

Width of the track is the difference between the radius of outer circle and inner circle = $$R-r$$

Inner circumference = $$2\pi r=352$$

=> $$2\times\frac{22}{7}\times r=352$$

=> $$r=56$$ m

Similarly, $$2\pi R=396$$

=> $$R=63$$ m

$$\therefore$$ Width of the track = $$63-56=7$$ m

=> Ans - (D)

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