Question

An athlete completes one round of a circular track of radius $10\, m$ in $40 \,s$. The distance covered by him in $2$ minutes $20$ seconds is

• A. 400 m
• B. 220 m
• C. 132 m
• D. 66 m

Answer 1

Answer: (B)

220 m

Answer 2

$\upsilon = \frac{2\pi r}{t}$ $= 2 \times \frac{22}{7} \times \frac{10}{40}$ $= \frac{11}{7} m \, s^{-1}$ Distance, $S = \upsilon \, t$ $= \frac{11}{7} \times 140$ $= 220 \, m$