a) 86 sec
b) 80 sec
c) 76 sec
d) None of these
Answer: b
Explanation:
$$\eqalign{
& {\text{B runs}}\frac{{45}}{2}{\text{m in 6 sec}} \cr
& {\text{B covers 300m in}} \cr
& = \left( {6 \times \frac{2}{{45}} \times 300} \right)\sec \cr
& = 80\,{\text{sec}} \cr} $$
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