A train travelling at a speed of 30 m/s crosses a platform, 600 m. long, in 30 sec

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RRB TC CC Exam (Chandigarh) 2008 click here to view all questions

A train travelling at a speed of 30 m/s crosses a platform, 600 m. long, in 30 sec.The length (in metres) of train is

A120

B150

C200

D300

Nithin K ? Apr 7 '2018 at 16:2

Answer is : B.) 150

Explanation:

Let the length of the train is x meter and Speed of the train is y meter/second
Then \(\frac{x}{y} = 15\) [because \(\frac{distance}{speed} = time\)] 
\(\implies y = \frac{15}{x}\)

\(\begin{aligned} => \frac{x+100}{25} = \frac{x}{15} \\ x = 150 \text{ meters} \end{aligned}\)

So length of the train is 150 meters

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Answer is : B.) 150 Explanation: Let the length of the train is x meter and Speed of the train is y meter/second Then \(\frac{x}{y} = 15\) [because \(\frac{distance}{speed} = time\)]  \(\implies y = \frac{15}{x}\) \(\begin{aligned} => \frac{x+100}{25} = \frac{x}{15} \\ x = 150 \text{ meters} \end{aligned}\) So length of the train is 150 meters Nithin K ? answered Apr 7 '2018 at 16:2 All Comments

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