a) 20
b) 24
c) 28.5
d) 30
Answer: d
Explanation:
$$\eqalign{
& {\text{Speed of athlete}} \cr
& = \frac{{200\,{\text{m}}}}{{24\,{\text{secs}}}} \cr
& = \frac{{200 \times 18}}{{5 \times 24}} \cr
& = 30\,{\text{km/hour}} \cr} $$
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