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The inner circumference of a circular race track, 14 m wide is 440 m . Then the radius of the outer circle is?

70 m
56 m
77 m
84 m

Correct Answer: 84 m

Explanation:

Circumference of a circular = 2πr
⇒ 2 x (22 / 7) x r = 440
⇒ r = [440 x (7/22) x (1/2)] = 70 m
∴ Radius of outer circle = (70 + 14) m
= 84 m

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