Quantitative Aptitude Ques 723
Question: A 300 m long train crosses a platform in 39 s while it crosses a signal pole in 18 s. What is the length of the platform?
Options:
A) 320 m
B) 350 m
C) 360 m
D) 400 m
Show Answer
Answer:
Correct Answer: B
Solution:
- Speed of train $ =\frac{300}{18}=\frac{50}{3}m/s $ Let the length of the platform be x m. Then, $ \frac{x+300}{39}=\frac{50}{3} $
$ \Rightarrow $ $ 3,(x+300)=39\times 50 $
$ \Rightarrow $ $ 3x+900=1950 $
$ \Rightarrow $ $ 3x=1050 $
$ \Rightarrow $ $ x=350m $
BETA
