a) 3.6 sec
b) 7.2 sec
c) 14.4 sec
d) 21.6 sec
Answer: c
Explanation:
$$\eqalign{
& {\text{Speed }} \cr
& {\text{ = }}\left( {60 \times \frac{5}{{18}}} \right){\text{m/sec}} \cr
& {\text{ = }}\frac{{50}}{3}{\text{ m/sec}} \cr
& {\text{Total distance covered}} \cr
& {\text{ = (100 + 140) m = 240 m}} \cr
& {\text{Required time}} = \left( {240 \times \frac{3}{{50}}} \right){\text{sec}} \cr
& {\text{ = }}\frac{{72}}{5}{\text{sec}} \cr
& {\text{ = 14}}{\text{.4 sec}} \cr} $$
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