a) 20 m
b) 25 m
c) 22.5 m
d) 9 m
Answer: a
Explanation:
$$\eqalign{
& {\text{Distance covered by B in 9 sec}} \cr
& = \left( {\frac{{100}}{{45}} \times 9} \right){\text{m}} \cr
& = 20\,{\text{m}} \cr
& {\text{A beats B by 20 metres}} \cr} $$
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