Question

An athlete completes one round of a circular track of radius 10 m in 40 sec. The distance covered by him in 2 min 20 sec is

• A. 70 m
• B. 140 m
• C. 110 m
• D. 220 m

Answer 1

The correct option is D 220 m

Time period = 40 sec
No. of revolution = $\frac{Totaltime}{Timeperiod}=\frac{140sec}{40sec}=3.5Rev.$
So, distance = $3.5\times 2\pi R=3.5\times 2\pi \times 10=220m$.