Quantitative Aptitude Ques 316

Question: 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?

Options:

A) 360 m

B) 260 m

C) 300 m

D) Cannot be determined

E) None of the above

Show Answer

Answer:

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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