a) 3.6 sec
b) 18 sec
c) 36 sec
d) 72 sec
Answer: c
Explanation:
$$\eqalign{
& {\text{Speed}}\,{\text{of}}\,{\text{train}}\,{\text{relative}}\,{\text{to}}\,{\text{jogger}} \cr
& = \left( {45 – 9} \right)\,{\text{km/hr}} \cr
& = 36\,{\text{km/hr}} \cr
& {36 \times \frac{5}{{18}}} \,{\text{m/sec}} \cr
& = 10\,{\text{m/sec}} \cr
& {\text{Distance}}\,{\text{to}}\,{\text{be}}\,{\text{covered}} \cr
& = \left( {240 + 120} \right)\,m \cr
& = 360\,m \cr
& {\text{Time}}\,{\text{taken}} = {\frac{{360}}{{10}}} \,{\text{sec}} \cr
& = 36\,{\text{sec}} \cr} $$
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