| A train speeds past a pole in 20 s and speeds past a platform 100 m in length in 30 s. What is the length of the train? [RRB (SO) 2010] |
A) 100 m
B) 150 m
C) 180 m
D) 200 m
E) None of these
Correct Answer: D
Solution :
| Let the length of train be x m. |
| \[\therefore \]Speed of train \[=\frac{x}{20}=\frac{x+100}{30}\] |
| \[\Rightarrow \] \[3x=2x+200\] |
| \[\Rightarrow \] \[x=200\] |
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