| Train A crosses a stationary train B in 50 s and a pole in 20 s with the same speed. The length of the train A is 240 m. What is the length of the stationary train B? |
A) 360 m
B) 260 m
C) 300 m
D) Cannot be determined
E) None of the above
Correct Answer: A
Solution :
| If the length of train B is x m, then speed of train |
| \[\Rightarrow \] \[\frac{240+x}{50}=\frac{240}{20}\] |
| \[\Rightarrow \] \[\frac{240+x}{50}=12\] |
| \[\Rightarrow \] \[240+x=600\]\[\Rightarrow \]\[x=600-240\] |
| \[\therefore \] \[x=360\,m\] |
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