Question

A race track is in the form of a ring whose inner circumference is 352352 m and the outer circumference is $396$ m. The width ofthe track is

• A. $14$ m
• B. $7$ m
• C. $21$m
• D. $\frac{7}{2}m$

Answer 1

Answer: (B)

$7$ m

$2\pi R=396$
$2\pi r=352$
$\Rightarrow 2\pi (R-r)=44\Rightarrow (R-r)=7$.

Hence,width of the track is $7m$