a) 314 m/min
b) 200 m/min
c) 300 m/min
d) 900 m/min
Answer: a
Explanation: Distance covered in one complete revolution
$$\eqalign{
& = 2\pi r \cr
& = \frac{{2 \times 100 \times 22}}{7} \cr
& \approx 628\,m \cr
& {\text{Average}}\,{\text{speed}} \cr
& = \frac{{628}}{2} \cr
& = 314\,m/\min \cr} $$
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