The inner circumference of a circular race track, 14m wide is 440m. Find the radius of the outer circle.  Choose the correct choice from the following options
A) 84
B) 12
C) 67
D) 28
E) 21

Rationale: "explanation : let inner radius be r meters . { \ color { black } then , 2 \ pi r = 440 \ rightarrow r = 440 \ times \ frac { 7 } { 22 } \ times \ frac { 1 } { 2 } = 70 m } radius of outer circle = 70 + 14 = 84 m answer : a ) 84 m"
Answer: A