Quantitative Aptitude Ques 498
Question: A train passes a platform 120 m long in 40 s and a boy standing on the platform in 30 s. The length of the train is
Options:
A) 350 m
B) 360 m
C) 370 m
D) 380 m
Show Answer
Answer:
Correct Answer: B
Solution:
- Let the length of train be x m. Speed of train while crossing a platform $ =\frac{120+x}{40}m/s $ and speed of train while crossing a boy $ =\frac{x}{30} $
$ \therefore $ $ \frac{120+x}{40}=\frac{x}{30} $
$ \Rightarrow $ $ 3600+30x=40x $
$ \Rightarrow $ $ x=360,m $
BETA
