A) 10
B) 8
C) 5
D) 3
Correct Answer: C
Solution :
Relative speed \[=\text{(60}\,\text{+}\,\text{40) km/h}=108\text{ km/h}\] \[=\left( \frac{108\times 5}{18} \right)\,\,\text{m/s}=30\,\,\text{m/s}\] \[\therefore \]Required time \[=\frac{\text{Sum}\,\,\text{of}\,\,\text{the}\,\,\text{lengths}\,\,\text{of}\,\,\text{both}\,\,\text{trains}}{\text{Relative}\,\,\text{speed}}\] \[=\frac{70+80}{30}\,\,\text{s}=5\,\,\text{s}\]
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