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A person is walking parallel to a railway line, at a speed of 5 km/h. A train traveling in the opposite direction at 49 km/h, passes him in 12 seconds. Find the length of the train.

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160 m

130 m

120 m

180 m

answer is D.

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Detailed Solution

Concept- We will use the speed formula:

Let us consider ‘l’ is the length of the train and 'it’ is the time taken by the train to pass the person.
First we will calculate the relative speed.

Now we will convert the relative speed km/h into m/s.

Finally, we will find the length of the train by substituting the values in speed formula
Question Image

Hence, the correct answer is option 4.

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