Question

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

• A. $44$ m
• B. $14$ m
• C. $22$ m
• D. $7$ m

Answer 1

The correct option is D $7$ m

Width of circular track $=r_1-r_2$
Width of the track is$=\frac{2\pi r_1-2\pi r_2}{2\pi }$

($2\pi r=circumferenceofcircle$)

$=\frac{396-352}{2\pi }$

$=7m$

Hence option ${}^{\prime }{D}^{\prime }$ is the answer.