A) 72
B) 10
C) 36
D) 18
Correct Answer: C
Solution :
Let the speed of each train be x km/h. |
Their relative speed \[=x+x=2x\] km/h |
Time taken \[\text{=}\frac{\text{Total}\,\,\text{length}\,\,\text{of}\,\,\text{trains}}{\text{Relative}\,\,\text{speed}}\] |
\[\Rightarrow \]\[\frac{12}{60\times 60}=\frac{240\times \frac{1}{1000}}{2x}\]\[\Rightarrow \]\[\frac{1}{300}=\frac{120}{1000x}\] |
\[\Rightarrow \] \[x=\frac{300\times 120}{1000}=36\] |
\[\therefore \]The required speed = 36 km/h |
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